the white house were the flags were lowered to half staff, president obama declared it terrorism. >> anytime bombs are used, it is an act of terror. what we do not yet know is who carried out this attack were white. >> the president brown -- vowed to bring the perpetrators to justice followed by a briefing on an investigation now led by the fbi. >> we will take over, we will go to the ends of the earth to ratify the subject or subjects who are responsible for this despicable crime. a federal investigators appealed for public. >> we're looking for the public school cooperation. we're looking to see if there's any video or photographic evidence. >> vice president joe biden said one thing is for certain. >> we will find out what happened. we will find out who did this.

>> lawmakers briefed on the probe say it is not clear if a foreign or domestic terrorist group or an individual is behind this. >> similar pressure cooker explosives have been used in afghanistan, india, nepal, and a julyn according to 2010 joint fbi and military intelligence report. >> while most of the people were running away from the scene, soldiers who recently returned from battles of interaction and ran toward the blast. many of them were 50 yards away from the explosions. picking up casualties and putting pressure on wounds. we were giving blood.

received anners who medal, it is proof of mental and physical toughness. they did receive their fishing metals. -- finishing medals. how iis like, this is not wanted it but is around my neck and i was part of this day. ews confirmed a preschool teacher was there. she was there to watch her mother across the finishing plant. from thes live airport. >> we have learned that social media is keeping the friends of brannick erica

informed. brannick is in critical condition. she is not the only one that was injured. her sister and brother-in-law were also hurt. >> erica is an incredibly unique person. she was injured when two bombs exploded during the boston marathon. decroce sustained extensive injuries to both of her legs. we're not clear as to -- for damage. lawthe -- her brother-in- receiving cuts and burns. all three of them were cheering on the mother of the women who was running in the race. the quex i have an image of her running up the sidewalk in my head. i am not having had spoken to her first. they are describing their

experiences as a real and chaotic. >> we wanted to the commotion of the regulation and the boston marathon bond here saying, you need to get out. you do not associate it, we were talking about this on the plane. you do not associate it with something and it is wrong. two blocks away when the blast happened. >> it was a pretty scary experience dues to the fact that we're military and we could not believe it that this happening with -- this was happening all over again. the first grade have run in a marathon. to go from this feeling of feeling triumphant and achieving my goals to something that is so much greater than that. so much bigger.

it put things in perspective. >> willmore note -- has been helping with the davenport free school. it is up to open this time and thea is said to be one of teachers there. incident has officials around the world boosting security at sports events and other large public gatherings including the more than 30 mullah bonds -- marathon is being held this weekend alone. training and the behavior pattern recognition could be helpful. -- theit will not be probability of stopping a terrorist using all those means a mentioned, the training, the surveillance and so on is under

50%. maybe it is now well under. t gives us the chance. >> police were focused on two incidents. quex covering the vice- president's appearance and i pray we will begin with the orioles game at camden yards. notice some things have changed. stadium workers removed as trash bags today. party -- among the fans for /t ht,

. forelcome sight travelers. with for more questions than answers about the bombing, who was responsible, what was the motive, edginess rules. in carroll county courthouse complex was evacuated and cordoned off after an anonymous caller reported a bomb -- a bomb threat. there were clear the call was declared hopea hoax. train travelers are seeing police present mindful of the days after 9/11. >> in penn station in newark, all the ambulance into their. a bunch of army guys and i believe -- [indiscernible]

, it seems likey it is not safe. they are learning from teh bombings.nd the president is set to arrive momentarily. there has been tight security around the area of charles street. tonight he is the keynote speaker for what is being called the previous celebration for the grand opening of the university of baltimore law school posing a building. any of events involving the vice president will have had the security and secret services and snowiest. -- the security

efforts have doubled inside and outside the building. >> increased sweep of the building, extra manpower from our perspective and all aware around. -- securityor furry in the backstage crew there assuming there are telling us. >> this event is not open to the public. the audience will be filled with political dignitaries, dignitaries from the school and owners. you have to go through a metal detector. this event has been on the vice president was a schedule for some time. more on themuch pass from emlen beckham -- from the visit. to be able tong get inside to hear the speech

tonight? --i can because i have the you can [indiscernible] will continue to follow the boston marathon explosions as more information becomes available. >> some of our other top stories as well as the insta-weatherplus forecast and tonight's report. stay with us.

>> the man facing more than a dozen counts of child pornography is being held without bail tonight. arrested friday following a police 16. he agreed to meet a 14-year-old for sex. the uncovered images of cell phones, computers, and videotapes. ' range from 2-s 14, including some of his own family members. chargesng a number of man.he hit and killed a ofre will be amoment honor. in hersl's

compelling evidence came in when prosecutors wheeled in a concrete slab. to applydetective for would floorboards and discovered the concrete mass underneath which have the outline of a body. once they lifted the concrete, there were skeletal remains beneath it. we expect to hear from the lead detective tomorrow. >> the baltimore countcouncil approved its storm water free raisefee rates. condos, $32 each year. the council amended the bill to lower the fees for non-private groups. churches will now pay $20 per to thousand square feet of them perseus or hard surface.

the fees are expected to generate $24 million for baltimore county storm water management program. runoff carry pollution that ultimately ends up in the chesapeake bay. >> now, your 11 is whether plus forecasts with chief meteorologist tom tasselmyer. >> at the airport, it is 74. a little bit warmer than normal. 65 is average. the sun broke through the cloud cover to boost the temperatures to above average ratings. it was a year ago that we tied the record high, 90 degrees on this day in 2012. it tied the record that was set in 2002. not quite that warm today but warmer than normal. it is pleasant out there now. we should have good conditions for baseball in baltimore this evening. temperature, 75 downtown. 71 around westminster. the mountains are mild. the lower eastern shore is pleasant. a little cooler along the bay

shore near the naval academy. get away from the cooling effect of the bay or the ocean, we're seeing some mild temperatures. there are some thunderstorms to the north and west that we have to watch closely. still many miles away. if they get here it will be after midnight. it is a cluster of powerful storms coming across ohio. the severe what covers much of pittsburgh and almost into garrard county. into west for jenna and eastern ohio. that is the front that is dropping into the warm area here. it could trigger a thunderstorm as the friends light sir. temperature kin contrasts. 30's over the upper midwest. more snow in the rockies. very cold conditions, temperatures in the 30's in denver. the snow continues to fall across wyoming. there is still some winter

weather. we will see that a cooling trend as it moves east, not until the weekend. a couple of scattered showers in the morning and the clouds that out in the afternoon getting temperatures into the low 70's. bashar activity will be mostly to the south in the afternoon. with any luck we will turn out to be a decent spring day. temperatures are mild and isolated showers of to midnight. bashar possible in the morning and mostly cloudy in the afternoon. highs around 70 degrees. the winds are turning to the northeast with waves around 1 foot. the water temperatures range from 56 to 59 degrees. 68 tomorrow. a chance for shower. thursday, before with some spotty showers. mild temperatures in the mountains. eastern shore has 20% chance of an isolated shower. partly cloudy on thursday. at the coast, temperatures a little bit cooler because the winds will be coming in off the

ocean. around baltimore, 71 tomorrow, a slight risk of a shower. mild on thursday with some sun. 76. almost 80 friday before the frontier friday night with some sun -- thunderstorms. the rest of the weekend is cool and dry. highs in the 60's and clotheslined 30's over the weekend. put there ready to finishing touches on the field get ready fore -- tonight's game. he rays played yesterday, completing before the bombings. detheoughts go out to the families. =

the rays were expected to set the pace. the rays rally. it wanted to get benefits of having the opportunity of facing that is struggling at the moment. that thea given other four teams are good. we have to know how how we are and how we will do that and stay true to that. tampa is too good. we will get a hornet's nest with them. there are lot better, they are of the boston club on the road. re >> the >> the ravens held their press

conference. talking about the draft before they make their selection on thursday night at 8:00 p.m. elan heading in with a dozen pecs. he hinted at taking perhaps a few more defensive players but the director deliver the most concise description of how all the ravens use the draft this year and every year to build a consistent winner. >> it comes down to watching the tape, ranking the guys, and drafting the best player when he is on the clock. we are going to draw the best player. a defensive tackle or corner or safety, it comes down to where they get paid and who is available. we have a trade auction and what are we going to do. >> maalot ted always been a buzz word and that includes the draft. picks, nine onft offense.

trade, that is more to the doubtful side. they already had 12 draft picks. they do not need more than that. tom tasselmyer has the seven-day forecast right after this.

reporting a suspicious letter sent to the u.s. senate. of ricinility poison. more on

a tense fornight,a showers. >>

on the broadcast tonight from boston, the toll of the dead and wounded from this city trying to recover from a terrorist bombing. tonight, we have the latest available information on the investigation so far including what exploded, the devices themselves and the cruel design behind them. also tonight, the deaths of the innocent victims and the stories emerging from a disastrous day. our special coverage, "nbc nightly news" from boston begins now.