hello, i'm nuala mcgovern, this is outside source. we begin in st petersburg, russia, where ten people have been killed and 47 injured in an explosion between two underground stations. the russian president was in the city at the time. law enforcement and special services are working and will do all they can to try and find the cause of what's happened. we'll also be live in washington where president sisi is visiting the white house. after a difficult few years, president trump says he'll ‘reboot‘ us ties with egypt. we are very much behind president el—sisi. he's done a fantasticjob in a very difficult situation. we'll bring you exclusive footage from mosul where the bbc has filmed so called islamic state militants appearing to use children as human shields. isis use the kids so they escape from our aircraft because they know we can't shoot on them. and in os sport — sunderland manager david moyes is in hot water — i'll tell you why. ten people have been killed

in an explosion on the underground system in st petersburg. the explosion happened between two stations sennaya plos—chad and tekhnologichesky institut stations. domi—tilla sagra—moso, lecturer in security and development domitilla sagramoso, lecturer in security and development at kings college london, talked to me about who might be behind these attacks. of course it is a bit early, but we can think of potential groups or individuals who could be behind these attacks. the first who come to mind are of course, fighters, jihadists from the north caucasus. they have been running a very long

insurgency, a jihadist insurgency against local authorities and the russian state for over a decade. although they have been severely weakened we cannot exclude that they might be involved in some form of attack. many of those leaders in these insurgencies throughout the region have sworn allegiance to assess, and many —— to isis. many have moved to fight with islamic state and other groups in iraq. there is a big contingent of fighters also from central asia who have been fighting the assad regime and have been supporting isis both in iraq and syria. there is a possibility that as they lose ground in syria and iraq they try to operate outside, as we know, and the russian leadership and regime has

been very much on the target list because of a strong support the —— that russia has provided to the syrian regime. as we think about this year to —— as we think about the security situation today, saint petersburg perhaps unexpectedly affected. many are in shock. what do you think will happen to russia, what does russia need to do to make it more secure if it is indeed other of these groups? i think it is very difficult as it is for many cities in europe, and other parts of the world, as we have known. how hard it is to be fully protected against a cts is to be fully protected against acts of terrorism. i think it is almost impossible. russia has very stringent controls on the borders, it generally tries to make sure that any potential individual who could be suspected of an attack, is barred

from entering the country. of course there are always mistakes and loopholes. i think that they can increase their efforts to control security, but the metro will always remaina security, but the metro will always remain a very soft target. rescuers in colombia are still searching for up to 300 missing people after map a huge landslide hit the city of mocoa in the west of the country on friday. colombia's president santos says the official death toll has risen to 254 but that figure looks likely to rise. let's take a look at some of the pictures that have come into our newsroom since friday. you can see the extent of the damage from this aeriel footage. from this aerial footage. rescue work is still underway but the devastation is total in some places. president santos has paid two visits to the city so far.

this is him touring the worst affected areas. let's cross live to mocoa now — laura bicker is there. —— let's bring up what he had to say to the nation on sunday. i know that the loved ones who were lost are irreplaceable and the pain will stay with us for ever that it the pain will stay with us for ever thatitis the pain will stay with us for ever that it is possible to mitigate it. it is possible to recuperate. it is possible to overcome the tragedy, hope is possible. we are going to dedicate ourselves to bringing hope back to isis, to bring them back their future. back to isis, to bring them back theirfuture. —— back to isis, to bring them back their future. —— bringing back to isis, to bring them back theirfuture. —— bringing her back to mocoa. this is lexi thompson. on sunday she was on the verge of victory in the ana inspiration when a helpful viewer rang in to point out she'd broken the rules a day earlier. her crime? moving the ball about half an inch.

rules are rules and with just six holes remaining she was given a four shot penalty which ultimately cost her the title. andy swiss has the story. just imagine it. on course for the win of your life, just a few holes from glory, but lexi thompson's dream was about to become a nightmare. the reason? this moment from her previous round. look closely. she walks to her ball, picks it up, then puts it down in a fractionally different place, which is against the rules. nobody noticed at the time but a tv viewer spotted it, alerted the officials, who then interrupted her final round to give her a four shot penalty. is this a joke? no, not at all. thompson was in tears. instead of two shots ahead, she was now two behind. her disbelief shared by the watching tiger woods, who immediately tweeted, "viewers at home should not be officials wearing stripes. let's go, lexi.

win this thing anyway." she came remarkably close. she battled back and on the final hole, had this putt to win. but agonisingly, victory slipped away. all because of that one eagle eyed viewer. i wasn't expecting that on whatever hole that was. i did not intentionally do that, so to the officials or whoever called it in, that was not my purpose. i did not even realise i did that. thompson later thanked her fans for helping her through. golf is no stranger to trial by television, but its results are rarely this painful. this is david moyes. he manages english premier league side sunderland. he's in hot water after telling a female bbc reporter she "might get a slap". it followed a difficult line of questioning during an interview two weeks ago. take a look. just getting a wee bit

naughty at the end there. just watch yourself. you still might a get a slap even though you're a woman. careful the next time you come in. i need to bring you the second part of this story. this was david moyes apologising earlier. it was in the heat of the moment and i deeply regret the comments i made. it's certainly not the person who i am. i accept it was a mistake. i spoke to the bbc reporter who accepted my apology and hopefully we'll move on. let's speak to tulsen tollett in the bbc sport centre. tulsen, we heard the apology from moyes there. he may‘ve thought it was the end of it but the fa has now weighed in too?

the english fa have asked david moyes to explain himself. may well have been one of those things in heat of battle, the pressure does get you. but it was probably the way he went about saying it. the way he intimated that points to vicki sparkes which may have got him in hot water. no malice i don't think from his apology, but on reflection he may want to sit back and take five seconds and think about it before he says that type of thing. u nfortu nately for before he says that type of thing. unfortunately for david moyes, he said it, it happened only has to move on from there. if you're a member the beginning of the year, p9p member the beginning of the year, pep guardiola spoke to david johnson ina similar pep guardiola spoke to david johnson in a similar interview but there was no disrespect on in that interview. he didn't intimate anything the way david moyes perhaps dead. that was the difference between the two. if we look at it from the bbc perspective, —— the way david moyes perhaps did. perhaps they don't like

it, but we have to be a conduit to the public and put those questions out there. managers, coaches, players etc cetera how to answer those types of questions and give the answer those types of questions and give the answers truthfully. david moyes just overstepped the line on this occasion. donald trump has been speaking ahead of a planned visit by chinese president xi jinping later this week. speaking to the financial times he was pushed on the issue of north korea and how he will handle the nuclear threat from the country. he said "if china is not going to solve north korea, we will. that is all i am telling you," pressed on whether he thought he could succeed alone, he said "totally." earlier we heard from xenia wickett from chatham house abut what options were available to mr trump. donald trump is making america great

again, so the idea that america would need others to solve what is, what then president obama said, probably the biggest imminent challenge obama to trample face when he takes over as president of the united states. the idea he will have to share that with someone else, that america will need someone else to help solve it, is clearly anathema. the reality is, trump has found that as obama did before him, you cannot do this. notjust without the chinese, but you cannot do this except as an international coalition. what could america do on its own? it could engage with north korea, build relations with them, north korea has made it very clear that it wants to build relations or engage, if you will, with the us. possibly, that's possible. but it's not clear that donald trump believes really a n not clear that donald trump believes really an engagement without a few sticks to go along with that. the

one option america might be able to do, and make real progress, because north korea wants to on its own. engagement is not one we are likely to see donald trump pursue. stay with us — in a couple of minutes we'll bring you a report from mosul where the bbc has filmed this footage of islamic state fighters appearing to use children as human shields to protect themselves from aeriel attacks. one in three adults in the uk is physically inactive and at risk from coronary heart disease according to a new report. the british heart foundation says an average person spends the equivalent of more than 70 days a year sitting down. the most inactive part of the uk is the north west of england, followed by northern ireland, wales and the north—east of england. danny savage reports from chorley in lancashire. along the leeds/liverpool canal this afternoon, a health walk was taking place. not enough people in this part of the country do enough exercise, so this group is trying to do something about it. you're getting the exercise,

you're getting the fresh air. you're seeing the countryside. and you just feel better. it kick—starts your day. yourjoints do seize up and i think you become mentally sad and miserable. when you're out and enjoying the weather, whatever kind of weather, even if it's raining, it's good to be out. but that's all very well for this group of people who were either retired or full—time students. what about those who are working? on a nearby business park, the only exercise some people might take is a walk to the sandwich van. that's borne out by the staff in this marketing firm. one girl started here a few months ago. she said, i'm going to walk. i'm going to bring my trainers and i'm going to start walking. just because of the demands of the job, you just get caught up in the daytime. it's very difficult to get out. they do keep fit but say determination is needed. there's more of a trend for people getting into exercise now. people are a bit more aware and health—conscious,

so they try and really fit it in. i still think it's difficult. there's not enough hours in the day. the british heart foundation says adults should do at least 150 minutes of moderate activity, or 75 minutes of vigorous exercise, every week, plus strength workouts. there's a running club at this tech company in manchester, where they positively encourage people to exercise during the working day. we sleep a third of our lives and we have a third of it at home. i think the third you have at work, you need to try and make as pleasant for people as possible. north—west england may have a problem with a lack of exercise but gps are formally recommending things like these walks, and little steps go a long way to hitting those exercise targets. danny savage, bbc news, chorley. this is outside source live from the bbc newsroom.

our lead story is: an explosion on a metro train in st petersburg has killed ten people and injured dozens more. the russian prime minister has called it a terrorist act. a bbc crew has seen first hand, so—called islamic state fighters using civilians as human shields. it happened in the iraqi city of mosul. for months, coalition forces have been trying to retake the city. this shows what territory so—called is now control. as you can see fully surrounded. a key part of the battle is in the sky. helicopter gun ships are being increasingly used but many are critical of the tactic saying its caused civilian casualties to go up. bbc persian's nafiseh khonavard and producerjoe inwood were given exclusive access to iraqi helicopter pilots flying over

mosul‘s front line. here's their report. far below, a city that was once home to two million people. we are flying with the helicopters of the iraqi army as they fight the so—called islamic state. we are now over old mosul, where the battle is at its fiercest, as well as the last isis fighters, there are many civilians still trapped in the narrow alleys. and this footage, taken from our helicopter‘s camera, shows the challenges the pilots in mosulface. radio: it shows armed men walking through a war zone with children. it shows armed men walking through a war zone with children. radio

military sources have told the bbc this is the clearest example yet of the use of human shields in mosul. on the ground, major osama explains why human shields are effective. isis use the kids so they escape from our aircraft because they know we can't shoot on them. they escape by this way. but many civilians have been killed since the beginning of the war. mohammed is one of the most experienced pilots in the army. he says sometimes he has to trust to a higher power. i ask my god, when i shoot every time, when i shoot the fire, "please, god, save the civilian, just kill the bad guys." the battle for mosul is notjust about taking back a city. it's about regaining the trust of its people. every civilian casualty undermines that work and so the iraqi forces have to take their time.

translation: we have two reasons for slowing down. one is the civilians, the second is that we have got to old mosul. it's a difficult part of the city to fight in, full of narrow streets with small houses. it's ancient and crowded. back above mosul, the pilots circle, looking for targets. they spot a group gathered in an alley. the men have seen us too. they shoot into the sky. the helicopter returns fire. gunfire it is clear why air power has been so vital. mosul is now surrounded but the battle for the old city will come at a cost. much of it paid by the civilians still trapped inside.

nafiseh kouhnavard, bbc news. the internet watch foundation has found that 60% of web pages containing child sexual abuse content are now hosted in europe with 37% of it is in the netherlands alone. they say 60% of the material they assessed in europe was hosted in europe. 3796 was in the netherlands alone. that's a big increase from previous years. you can see from these figures provided by the foundation that europe and north america have switched places from 2015 to 2016 — with the majority of images hosted by european domains. zoe kleinman explained what's changed. the issue is not so much that europe

has got worse at hosting illegal content, but rather that north america has gotten better at policing it. in the us now, isps, internet service providers, have to report any illegal content they are hosting. that has led to a huge rise in it being flagged and ultimately removed. it's also interesting to note that the internet watch foundation which produce this report but the netherlands at the top of the list of european countries hosting the most illegal content. one dutch mp told us that they were also seeing a rise in the of complaints. the panama papers hit the headlines a year ago when the scandal rocked governments and expose some high profile individuals and triggered a number of investigations around the world. but have they made a real difference? we have this update. world. but have they made a real difference? we have this updatem

was exactly a year ago that the biggest leak in history was revealed by journalists. the panama biggest leak in history was revealed byjournalists. the panama papers showed just how the rich and powerful use tax havens to hide their wealth. the 11 and a half million documents came from one extremely secretive panamanian law firm. in the files we found how some of its clients were able to launder money, dodge sanctions and avoid tax. iceland ‘s prime minister was forced to resign after it was revealed he owned an offshore company with his wife. some of president putin ‘s friends were also implicated, and even then british prime minister david cameron was forced to respond to the discovery of his father ‘s offshore fund. theirfounders are of his father ‘s offshore fund. their founders are now in custody, having been denied bail. overall, more than 150 formal enquiries have been launched in around 80 countries. the government is investigating more than six and a half thousand taxpayers. so far,

$110 million has been recouped. but seven of the ten countries in which current or former seven of the ten countries in which current orformer heads seven of the ten countries in which current or former heads of states we re current or former heads of states were named in the panama papers have remained silent, including saudi arabia, qatar, and ukraine. countries like ireland, germany and the us have introduced new laws to combat issues that have arisen from the revelations. progress in combating some of the illegal activities are nursed by the panama papers has been made. but to bring about long—term change will be a much bigger battle for governments around the world. an andy warhol portrait of chairman mao has been sold at a historic auction in hong kong, to an asian collector. but the piece didn't manage to generate the frenzied level of buying that had been anticipated. here's our hong kong correspondentjuliana liu. 80 million... and selling for $86 million. sold! when the hammer came down, this iconic painting of chairman mao was sold for $11 million. it was the first time a warhol depiction of the chairman had been offered at a public auction

on chinese soil. the price, though, unexpectedly fell short of its lowest estimate. the absolute star of the auction was this piece by andy warhol. but the sale disappointed, the painting failed to fetch as much money as the auction house expected. critics say that it could be because the chinese art world is recovering from a crackdown by the president xi jinping. political imagery is highly controlled on the mainland. it could have a lot to do with the anti—corruption campaign that is happening in mainland china, and that could have discouraged quite a few of potential interested chinese mainland buyers. political imagery is highly controlled on the mainland. four years ago, pieces from this series of paintings were banned from an exhibition in beijing and shanghai. the mao pieces were part of andy warhol's most acclaimed works. he began the series in 1973, after the us president,

richard nixon, made a historic trip to china, to meet the chairman. at the time, mao zedong was one of the world's most famous people. when you look at this work, you see andy warhol's fascination for celebrities will stop by choosing also this image, the most reproduced image in the communist world, you see this work ofjuxtaposition between capitalism and communism. the painting was won by a collector in asia, so it is a homecoming, of sorts, for this famous portrayal of a chinese icon by a western artist. juliana liu, bbc news, hong kong. that's it from me and the team. we will be back tomorrow, do stay with the bbc for updates on all of the stories. quite a bit of sniffling and

sneezing going on across england and parts of wales with a high tree pollen count, we also saw a good deal of sunshine. temperatures are around 18 celsius. but we will not see temperatures that tie over the next few days nor the same level of tree pollen. all these weather fronts are moving in from the west, eventually we will see this cleaner, fresher, atla ntic we will see this cleaner, fresher, atlantic air moving in. rain will move away from scotland and northern ireland, it will turn a bit chilly hip temperatures should be up around eight or 9 degrees first thing. generally speaking, this week is a bit cooler. 1a to 15 degrees will be quite typical. not much sunshine for eastern england go through the day on tuesday, a lot of cloud and outbreaks of rain on and off. after a grey start in wales will begin to brighten up in the afternoon. quite windy further north, northern scotla nd windy further north, northern scotland in particular. that's where we will see some showers moving through on the breeze. into the

afternoon, staying largely dry, and it's stride too with some cloud and sunshine in northern ireland in northern england too. some sunshine to be had in wales, 10 degrees near the coast of cardigan bay. around about 15 degrees in cardiff. 12 or 13 in the london area, with that cloud and patchy rain on and off through the day. it chilly start on wednesday, bright for many. still quite breezy across the north and west. it here where we are most likely to see a shower or two through week. we will probably hang on to the best of the sunny spells in the west. 1a degrees in london, 11 sofa glasgow. high pressure through the middle of the week, that will last through until the end of the week as well. not a great deal of change really. still got high pressure in charge, weatherfronts going around the top of that ties in most going around the top of that ties in m ost pla ces going around the top of that ties in most places will be dry. more windy across northern parts of the uk and we might see some rain. most places are fine and dry with lighter winds

further south. 15 degrees london, not so bad. a little bit of sunshine poking through at times. as we head towards the end of the week, but higher still with us and still a fair number isobars across north england in particular. again, it's in the north and west with the breeze, but there is a chance of seeing at least a little bit of rain elsewhere. it is fine and dry. variable amounts of cloud and some sunshine, temperatures in the range of 1a to 15 degrees. that big higher still with us in the start of the weekend, still a bit breezy in the north and west and we might see a bit of rain. lighter winds further south and again, variable cloud, some sunshine after a chilly start. starting to see some changes for the second part of the weekend, as the high—pressure drifts away to the continent. in the south, the influence of that tie will still be felt for his second part of the weekend. however, looking ahead into

the following week, changes on the way. we lose the high—pressure and it looks like low pressure will be taking over. as it does, we will see quite a cold north—westerly winds developing. that will spread its way right across the uk. as does, it is likely begin increasingly unsettled weather with it. ten days from now, noticeably colder with some rain at times and even cold enough for a bit of wintry weather over the hills in the north of the uk and that rain will accentuate the chilly feel across england. it happened on the city's underground system, as a train carriage passed through a tunnel. officials quickly closed the entire underground network, and an explosive device was found at a different station, and made safe. translation: there was a huge bang. it was deafening. i was sitting next to a metal railing and i think it saved my life. everyone was knocked in one direction by the blast. we'll have the latest from st petersburg, where some reports suggest a suicide

bomber was responsible. also tonight... talk of a military conflict over the future of gibraltar is dismissed by downing street, amid talk of getting a good brexit deal. we will be working closely with the gibraltar government, as we have