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weekend campaigning across the nation. here in the valley some are getting ready for the caucus next month. nevada will be the first western state to make it's voice heard in the presidential primary. ((senator aaron ford/nv senate democratic leader: "it's an opportunity for democracts engaged early on to learn the about the process of caucausing.the actual caucus will take place on feb. 20th but we are starting early training our community about the process what it's going to be like and the nuts and bolts of it." )) ((kirsten joyce)) today's mock caucus training was hosted by state democratic leaders. eligible nevada voters are able to pre-register for the caucus online./// ((brian loftus)) > c-c-s-d has a lot to be proud of... and every friday we showcase standout students, in what's cool at school. this week, we highlighted some great kids as twitchell elementary. they've been busy gearing up for an upcoming robotics competition. the goal is to work as a team to create a functional robot that can complete specific tasks. that includes rolling up and down a ramp...as well as some

picking up a ball and making a shot. students we talked to say the challenge to create a moving machine is all part of the fun: ((demi lira 5th grade "we get to work with different people and we get to cooperate and the robots are really fun to work with." samuel chen 4th grade "we all try to make it the best it can be, so when we actually figure it out, we try to make it even better than that." )) ((brian loftus)) > if you know something that's cool at school just head to las vegas now dot com.. click on "sections" in the upper left corner .. and cool at school will be under the "community" tab. or send us an email... cool at school at las vegas now dot com. ((brian loftus)) ((kirsten

((sherry swensk)) clouds will close out our saturday evening... so temps will cool off slowly. we're near 50 degrees now... and then we'll cool off more quickly overnight after the clouds shift east of the area and clear skies greet us for sunday morning. ............... outside the valley... temps right now also close to 50 degrees in pahrump... down to primm and up to mesquite. laughlin in the upper 50s. .............. we were farther off the mark of normal today with that thick deck of clouds. highs officially just up to 53... and the normal afternoon high is 58. our start at 40 for a morning low was slightly above the norm

the sun hasn't been down long... but we didn't get to see much of it anyway today. just a hint of blue off around the edges of the valley. ............ it was a dry week... and a much different week than how we started off the new year... with all those storms that plowed into california and brought us some nice rainfall. and good snow to the local mountains. now we're just getting the clouds, but not the benefit of the rain and the benefit of the rain and mountain snow. ................. so the typical el nino pattern that we've been looking for this winter season should have those warmer pacific storms rolling into southern california like they did two weeks ago... but now a ridge of high pressure has set up off the southern california coast blocking those pacific storms and keeping them

pattern. ......... and when that happens - the storms get rung out over the sierra and we get very little left for us here in the desert and that is just what has been happening now. .................. california has been getting so more rainfall and much needed snow... that's great news... and northern nevada has been getting a little, too.... but really nothing left for the desert after the mountains get done with these storms. ................. there's been rain in the deep south... and more artic cold in the northern plains. the chiefs and the patriots missed that super cold air... and even the heavier early morning rain brought into the northeast from a nor'easter set up at the end of the week. .......... those early morning showers were over by midday and gametime was cool, but dry. thank goodness because the stadium has no roof. the game ended with temps in the mid 30s. ................ as karen castro said, a lot of folks still wanting to head up to the mountain and see the snow and play this holiday weekend... temps will make it back up to afternoon... red rock in the mid 50s... and overnight lows in the low 20s. ...... lake mead should make it to the nicer low 60s with more sunshine the mid 60s. ........... the valley... but some nicer clearing as the night goes on. mps drop to ar 40 degrees by

out as well. hav't had 60s since beforechristmas!///demetria obil)rht now,'re sing a lot of traffic onrtound i-15.tomorrow night the northbound 95 ramp to 215 in the northwest will close down for several hours for construction related interchange. the exit is scheduled to reopen monday morning around five am. henderson, starting monday, the stephanie street bridge over us 95 will shut down for 90 days. right now, contractors are working to widen the overpass and improve stephanie street. during this closure, you will be detoured using galleria drive and russell road. < > ((brian loftus)) > looking to get more green this year?...we got you covered. ((kirsten joyce)) the event happening this month that can help you get rid of everything from outdated electronics to expired medication in a safe environmentall y-friendly way.///

switch to centurylink prism tv, and get the same great channels cable gives you, without having to deal with cable. yes and? and...there's whole home dvr. plus tons of on demand options so you can watch whatever, whenever. yes and? why do you guys keep saying that? it's the first rule of improv. by saying "yes and," we accept the reality created by our comedy partners, paul. yes, right, i know. do you? feel like a hollywood insider

((kirsten joyce)) the 8 news now living green super recycling event is coming up! ((sherry swensk)) it's happening saturday, january 23rd at the thomas and mack. you can recycle all sorts of electronics... get rid of your unused and expired medicine... and bring paperwork that needs shredded. goodwill will also be collecting household items. for the complete list of what we'll be accepting -- head over to las vegas now dot com./// ((sharie johnson)) > that's it for us. join us again at 6:00.///

>> axelrod: independence day for five americans who had been held in iraq. they are freed as the u.s. and other world powers, the sanctions on iran release billions in frozen assets. americans are among the survivors of a terror attack in west africa, but some are still missing. the water crisis in flint, michigan. movie director michael moore returns to his home town calling for the governor's arrest. >> 10 people were killed here because of a political decision. >> that's right. >> to save money. >> l.a. rams! >> axelrod: and the tale of two nfl cities. >> l.a. rams. >> axelrod: homecoming party for the los angeles rams, a fight in san diego to keep the chargers from bolting. captioning sponsored by cbs this is the "cbs evening news." >> axelrod: good evening. i'm jim axelrod, and this is a western edition of the broadcast. in a major diplomatic

states and iran conducted a prisoner swap. four americans held in iran, including "washington post" reporter jason rezaian, were exchanged for seven iranians held in the united states. a fifth american, a student, was released separately. hours after the exchange, the u.s. and five other world powers-- russia, china, britain, france, and germany-- lifted sanctions on iran and released billions in frozen assets, implementing the landmark nuclear deal reached last summer in vienna. charlie d'agata is there. >> reporter: among the four americans coming home are "washington post" journalist jason rezaian,, former u.s. marine, amir hekmati, american businessman, nosratollah khosravi-roodsari, and christian pastor saeed abedini. the four men were exchanged for seven iranians who were imprisoned or chargeed in the united states.

wife naghmeh in boise, idaho. >> it's a huge burden lifted, and the kids are so happy it's been amazing. it's like christmas and birthday and everything, all the presents, all in one. >> reporter: a fifth american, matthew trevithick, was also set free after 40 days' detention in an iranian jail. and tehran pledged to determine the whereabouts of robert levinson, retired f.b.i. agent who disappeared nearly nine years ago. the unexpected news broke just ahead of the i.a.e.a. announcement that iran had complied with obligations on the nuclear deal that will bring crippling sanctions to an end. the country of 80 million people has been on an economic time-out for more than 30 years. now it's open for business. u.s. secretary of state john kerry: >>... that iran has followed through on the promises that it made.

continue to do the same, but we will also remain vigilant in verifying iran's compliance years ahead. >> reporter: the agreement means iran can now sell oil on the open market. the country will have access to the global banking system. iran can immediately recoup around $100 billion in frozen assets overseas. but while european companies can now do business with iran, for american companies, most restrictions still remain in place. and u.s. banks cannot trade directly with iran. the prisoner swap may be a gesture of good well between both countries, jim, but even before the nuclear deal was inked, the white house said there remains ample reason to distrust iran. >> axelrod: charlie d'agata in vienna. thank you very much. once released, the americans will head to a u.s. military hospital in landstuhl, germany.

elizabeth palmer tonight. liz, what can you tell us? >> reporter: well, the plane carrying the four americans hasn't left tehran, and conversely, in the united states, one of the iranians that the americans agreed to release as part of the swap hasn't left the jail where he was being held. so there are, clearly, some last-minute hitches. these negotiations have been going on for months. they were announced today, but really were-- began in earnest late this summer when it looked as if the nuclear deal was going to become a reality. >> axelrod: once the americans are released and they do end up land stall, what is likely to happen at that point? >> reporter: they will get a complete physical and psychological work-up to make sure they're okay. they've been in a notorious jail for months, in some cases years. and so landstuhl has a long history and a lot of expertise

americans who were kept hostage or prisoner overseas have come here for many years. it can also act as a bubble so that they can see family and readjust to the idea of being free before they face what, in this case, exwairks is going to be a media storm. >> axelrod: elizabeth palmer in landstuhl, germany. thank you very much. on the campaign trail, donald trump and ted cruz praised the release of the americans, but said iran never should have held them to begin with. as julianna goldman reports, that's about all the republican front-runners can agree upon these days. >> here we go. >> reporter: climbing out of a stuck elevator, ted cruz laughed off the possibility that a certain candidate is conspiring against him. >> who put donald trump in charge of the elevators? >> reporter: it was a brief moment of levity in the snow balling feud between the two leading candidates, donald

>> it seems donald has a lot of nervous energy. >> reporter: cruz seemed to be prompting the gop front-runner. trump raised questions about whether crudz's canadian birth disqualifies him from being president, and his dismissal of new york values. >> i think in terms of a commander in chief, we ought to have someone who is isn't springing out of bed to tweet in-- in a frantic response to the latest polls. >> there a lot of people do not like ted to, put it mildly. >> reporter: in new hampshire, trump said he's getting under cruz's skin. >> as it turned out, you know, he finally went off the wagon a little bit and went a little crazy. >> reporter: with the two insurgent g.o.p. rifles battling it out the race for an establishment republican pick is also heating up. in iowa, marco rubio was battling on all fronts, alleged

like president obama's, and calling out trump and cruz saying anger alone isn't enough to be president. the democratic race has also entered a more antagonistic fails as polls in iowa and new hampshire have tightened considerably and shows bernie sanders as a real threat to clinton in both states. jim, they'll square off in sowk tomorrow night, the last debate before the iowa caucuses. >> axelrod: julianna goldman covering for us tonight in our washington newsroom. thank you. several americans are among the survivors of a terror attack last night in west africa. at least 28 people were killed in the assault on a hotel and cafe in burkino faso. as jonathan vigliotti reports, the failt of some other americans is still unclear. >> reporter: video captured the moment burkino faso security forces, guns drawn, moved in saturday morning. the target-- the splendid hotel, a luxury building in the capital

inside, a group of heavily armed terrorists, their hostages, and many others hiding for their lives. the hotel and a neighboring cafe came under siege the night before. the attackers stormed in with guns, planted explosives, and reportedly debtinated car bombs. witnesses say they yelled allahu akbar" while opening fire. "people were lying on the ground, and there was blood everywhere. they were shooting people at point-blank range" said yannick sawadogo. three americans were rescued, four escaped, and eight sheltered in place until the battle was over. two remain unaccounted for. local police, supported by french commandose and two members of the united states military, eventually took back control this afternoon. officials say three attackers were killed, including two women. more than 100 hostages, some of them young children, were brought to safety. paramedics were seen trying to

away, including this wounded soldier. the dust hadn't even settled before al qaeda and the islamic maghreb took credit for the attack. they are the same group that carried out a similar assault on a hotel in mali that left 20 people dead. and today's siege signaled an expansion for the terror group. jirnlg up until now, they've only carried out minor attacks along burkino faso's border. >> axelrod: jonathan, thank you. today, president obama declared flint, michigan a disaster area, clearing the way for federal aid. the problem is contaminating drinking water. adriana diaz is there. >> we need to get these pipes out of the ground! >> reporter: the president's announcement did not quell anger outside flint city hall, where flint-born activist michael moore blame the the governor for a crisis that goes beyond water. >> it's not just the water crisis. it's a racial crisis. it's a poverty crisis.

began in april 2014 when the city switched its water source to the flint river to save money. but the corrosive river water wasn't properly treatd and stripped lead from pipes, causing a number of children with high lead in their blood to double. we spoke to flint's may have karen weaver momentes after president obama approved federal funds for flint. >> for almost two years we've been crying this and, you know, begging and asking for some clean water. >> reporter: lead in drinking water should not exceed 15 parts per billion. in flint, more than half of the homes sample head over 1,000 p.p.b. the highest rating was 13,200, more than twice what the e.p.a. considers toxic waste. dr. marc edwards of virginia tech conducted the water tests. >> this could have been stopped much, much earlier. and, unfortunately, the state and e.p.a. misleading people for all this time, no one knew to even look for this problem.

persisted for a year and a half before officials admitted there was contamination and switched back to the original water source. but the damaged pipes still make the water unsafe to drink. that's why the national guard will be handing out water for the foreseeable future. michigan's attorney general is looking into whether state laws were violated in this manmade public health disaster. jim, he joins the federal justice deps and the e.p.a., who are also investigating. >> axelrod: adriana, thank you. another serious public health emergency continues to unfold in the louis suburb of porter ranch, where a natural gas leak has forced thousands from their homes. carter evans was there as the people of porter ranch packed a church demanding answers. >> what are you doing now to help us? ( cheers and applause ) >> reporter: three months after natural gas began pouring into their neighborhood, angry residents were in no mood to

>> we're not concerned about others. >> reporter: and with a litany of health problems-- >> nose bleeds, nauseous, just couldn't stop coughing. >> reporter: nancy and larry davis say they had to leave. the gas company is taig saig there will be no long-term health effects. do you believe it? >> no. i have a biochemistry degree, so i know. i-- i don't trust eye don't believe that. >> reporter: infrared video shows the enormous plume spewing from a damaged well in the hills above porter ranch. air quality measurements from independent researchers show elevated levels will of methane, 67 times above normal. could be two months before drilling is complete on a relief well, one short-term fix called for burning off the leaking gas, but state regulators are concerned that plan could cause an explosion. >> there's just this holding pattern that the community's in. >> reporter: paula cracium is president of the neighborhood council. >> we have people that were in the process of selling their home here.

they now have two homes because that one fell out of escrow. you have a home up here that you can't sell right now. >> reporter: along with the fear that their on town will never be the same. carter evans, cbs news, porter ranch. >> axelrod: still ahead, the latest on the nfl's possible