three days later, three days after tamerlan tsarnaev died on the streets of watertown, law enforcement in florida tracked down this man, reportedly his friend. ibragim todashev, a friend of tamerlan tsarnaev, older of the two boston bombing suspects. he worked out at the same gym with him in boston before he moved down to florida. starting on april 21st, remember the bombing was april 15th. this is less than a week after the boston marathon bombings. on april 21st, law enforcement started interviewing him. they interviewed him multiple times in conjunction with their investigation of the marathon bombing. it has still never been alleged that ibragim todashev had a connection to the bombing other than knowing one of the suspects. that got him intense attention from the fbi, including several of his friends being not just questioned but also being arrested and being deported from this country on immigration charges including ibragim todashev's girlfriend who he was living with at the time in orlando, florida. on may 21st, of last year, 5 weeks after the marathon bombings, a month after t

and they are on the streets of watertown right now, engaged in a shootout with the watertown police department" ( gunshots ) >> pelley: it was combat. two suspects threw pipe bombs and a pressure cooker bomb at the police. an officer was gravely wounded. those who argued that releasing the pictures would cause the suspects to run were right. was putting the pictures out the right call? >> douglas: yes, i think, at the end of the day, we really had no choice. believe me, the death of sean collier is not lost on the fbi. we consider it an incredibly tragic event. but i think, at the end of the day, given the facts as we knew them at the time, we made the best decision. >> pelley: how do you feel about that decision now? >> deslauriers: i stand by that decision, scott. nobody could have reasonably foreseen that a police officer would be murdered. what could reasonably be foreseen is that these individuals could have had more bombs, could have set those bombs off and caused carnage similar or even greater to than what they caused on april 15. >> pelley: one suspect was killed, the other vanished.

. >> that afternoon, police in watertown, new york, just 25 miles from the canadian border, stopped a car from driving the wrong way down a run one-way street. it was curtis pope. he tried to run. but was arrested at a shopping center. curtis pope was returned to texas. he stood trial and was convicted of first-degree murder. he was sentenced to life in prison. it was an unusually bloody crime scene. but darrell north unwittingly provided the evidence needed to convict his killer. >> he probably bloodied curtis pope's nose. we have always thought darrell helped to convict curtis pope. >> the forensic evidence in this case was absolutely the linchpin of the entire case. >> this case stands out to me because it is one of the best of the uses of dna, combined with blood stain pattern analysis where working together, the two show who the blood came from and provide a scenario about which it possibly got there. >>> up next, a woman fears for her life. >> judy was afraid. >> she expected something to happen to her. >> he was waiting for her in the house! >> does she know who shot her? >> th

from watertown, dr jim walsh, an expert and international security and a fellow at the massachusettstitute of technology's security studies program. technology is everywhere. i can track my family's flights through an app on my iphone. how can a plane weighing 143 tonnes plus vanish? >> very perplexing. there are several scenarios that one could run through that might answer that, but none seem completely satisfactory at this point. that aeroplane not only was tracked by radar, but probably by a system called ads b, which is a satellite system which is more precise than radar. i'm not sure that pt malaysians are using that. i yes they have two ground stations within the country. >> nows of passengers with stolen passports sparked fear of terrorism. the federal bureau of investigation is involved. a handful of countries verify passports with interpol. i saw a number, that a billion people travel internationally without having the passports checked. it's all too common. >> it is incredibly common. passports are owned and run by individual governments. there are 199 different government

jim walsh research associate with the security studies program nit, from watertown. thank you for joining us. >> the uncertainty is taking a toll on the families. this report from kuala lumpur. >> the lack of information is too distressing. still no clear direction of where the search for the missing malaysian airlines flight is heading. the atmosphere is dense as relatives meet officials from the airline in beijing. but they don't find the answers they are hoping for. >> we have been stuck here too long. every day is a torture. i don't know how many more days we'll have to wait. i want accurate information as soon as possible. >> in kuala lumpur families have been put up in a hotel while they await news. volunteer caregivers have been assigned to help them cope. >> they hope the airplane will be fine and the family is safe. few of the family, they think the chances are low. they are prepared to accept what may happen. >> across the country though some have not given up hope, placing the safe in higher powers. >> we just perform for the sake - for the safety of the i

both his father and you l were fire liewrts in nearby watertown, and had been with the boston fire department for nine and a half years and was stationed at engine 33, ladder 15, just blocks from the building where the fire occurred. lieutenant walsh and firefighter kennedy are american heroes. their memories will live on as examples of the extraordinary courage and dedication at the very heart of the boston fire department and in the hearts of firefighters everywhere. boston is strong because of heroes like lieutenant walsh and firefighter kennedy, who placed the safety of others before themselves. in this 9-alarm fishings there were zero civilian casualties. these two brave men put their lives on the line so that others could go on living. i offer my condol condolences. massachusetts has lost two of its finest sons and i grieve along were the rest of the commonwealth, with senator warren and with everyone for the loss that has been suffered. madam president, i doubt the presence of a quorum. the presiding officer: the clerk will call the roll. quorum call: quorum call: quorum call: a senato