after we learned that the fbi had looked into tamerlan tsarna tsarnaev, relatively recently after a foreign government reported to be russia, alerted american authorities to this guy. and saying that they were concerned. he may have had, quote, extremist ties. apparently the fbi says it was unable to find anything, and they cleared him and closed the case in 2011. again, we understand that the unnamed, officially unnamed foreign government was asked to follow up if it got any further intel. to contact us again. but that never happened. so did someone somewhere drop the ball? joining me, steve, a former assistant director of the fbi, number three guy at the fbi, who also served as chief of the fbi's counterterrorism section, had 27 years with the fbi. so we're honored to speak with you today, steve. you're a great guest to have on this. >> thanks, megyn. >> of course, there's going to be monday morning quarterbacking on this. the fbi got this guy, ultimately got this guy and the brother within five days of the attack. but we have to take a hard look back and find out why they didn't have him

that is thursday night's gun fight that wounded tamerlan tsarna tsarnaev, and i want to go back and ask what you saw? you said that was your neighborhood? >> yes, it was 1:00 in the morning and i was asleep and woke up to the house shaking in a loud boom. at first i didn't think it was too much. and you know, i heard a second boom and realized that something was going on so i went to the window. by the time i got to the window, about three police cars came up and parked right in front of my house and got out and immediately started exchanging gun fire with the individuals. i couldn't see them, because think were down the street bhoked by a house. >> but you were on the third floor? >> yes, correct. >> but you did see the exchange between the police and the brothers. you said that older brother, tamerlan charged police officers? >> yes, he did. at one point he ran toward the police and tried to go across the road and a police officer went out and grabbed him and took him to the ground. >> so the police had them corner and the older one got out of the car. >> i couldn't see if they were i

tamerlan tsarnaev was killed. and his younger brother dzhokar tsarna tsarnaev, the search for him put the entire city of boston instay indoors with doors locked. do not open the door for anyone other than a properly identified law enforcement officer. >> reporter: the streets desserted, mass transit shut down. as police search for dzhokar tsarnaev. >> turn yourself in and ask for forgiveness. >> reporter: between the shootouts and the car chase last night and of course the capture tonight of this second suspect, there was this. much of the boston area was on a police lockdown. authorities asked everyone, stay inside. they were out searching for this younger suspect, younger brother who had yet to be caught. now have so many schools in boston, not shutti inting their. train, bus services were halted. it was almost erie trying to be out on the streets. it was tough to catch a cab. sporting event in boston are canceled. it's said that the shutdown cost the city more than $330 million. i spent my day in cambridge. we were a block from where these two young brothers lived. i spoke to one of his wrestling teammates. wh

tamerlan and dzhokhar tsarnaev used a remote control device similar to use for a toy car. that could be a critical piece of evidence for the bombing investigation. also, we've learned that anzor tsarnaather of the bombers are set to fly to the u.s. as early as tomorrow. we found out that the russians not only warn the fbi about the possible radicalization of tamerlan tsarnaev, they also asked the cia to check him out. neither agency felt there was enough hard information apparently to have done at the time. we begin our coverage here in a windy and rainy boston this morning. good morning, miguel. >> good morning there, john. lots of important details out there that are coming to life. this is a massive investigation. i want to take you back to the beginning. this is the finish line of the boston marathon. we're on boylston street. it's shocking to me how close this is. the site of the first bombing now hallowed ground here. investigators tell cnn and other news agencies at least one of the homemade bombs was triggered by remote control, possibly a crucial clue. were the devices based on a blueprint in al qaeda's english language magazine inspire or similar to ones built in cams by d