Nightly News   |  April 22, 2013

Crucial, unreleased video implicates Dzhokhar Tsarnaev

Video from a restaurant surveillance camera shows Dzhokhar Tsarnaev walking toward the scene of the second bombing and slipping his backpack off, investigators say. In addition, the FBI says agents searched Dzhokhar Tsarnaev’s dorm room and found a large pyrotechnic as well as BBs, a white hat and a black jacket resembling what was worn in the bombing suspect photos released by the FBI. NBC’s Pete Williams reports.

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>>> good evening. it is a bit hard to believe it's been a week since the bombings in boston and yet today ten minutes to 3:00 eastern time marked a week exactly. in parts of boston , you could hear nothing at all. something else happened today. the surviving bomber was charged. and as often happens, the feds came public with details of what they have gathered so far in this investigation that none of us had heard before. pete williams has headed up our coverage since first word of the bombing a week ago. he starts us off again tonight from our d.c. newsroom. pete, good evening.

>> reporter: brian, good evening. the government says it has photographic evidence placed the suspect at the scene as well as physical evidence tying them to the bombs. we are learning new details about the car jacking last thursday that led to a violent shootout in the boston suburb of watertown . at 2:38 last monday afternoon, 11 minutes before the first bomb goes off, the fbi says, a surveillance camera catches dzhokhar and tamerlan tsarnaev walking toward the boston marathon finish line with backpacks. a crucial piece of evidence comes from a surveillance camera mounted on this restaurant. at 2:42, seven minutes before the first bombing, court records say the video says dzhokhar tsarnaev walked toward the scene of the second bombing. he works his way into into the crowd and slips his backpack off. still photos show the backpack on the ground at his feet. when the first bomb goes off the fbi says the video shows the crowd looking toward the finish line in alarm. but the fbi says tsarnaev virtually alone among the individuals in front of the restaurant appears calm. he walks away, it says, without his backpack. ten seconds later the second bomb goes off in the spot where he left the backpack. the fbi says both the marathon bombs were made with pressure cookers and contained metal b.b.s coated with adhesive. they contained hobby fuse similar to this. at the scene of thursday night's shootout with the bomb suspects in watertown , investigators say they found another bomb made with the same brand of pressure cooker and also hobby fuse and bbs. agents searched dzhokhar tsarnaev's college room and found bbs and a large pyrotechnic, a white hat and black jacket resembling what was worn by the man in the bombing suspect photos released by the fbi . a former federal prosecutor said it is a surprisingly solid start.

>> they took unknowns and made it virtually a known a week later. the entire toift law enforcement in this case should be commended for their efforts.

>> reporter: court documents contain new details about thursday night's car jacking . the fbi says surveillance pictures show dzhokhar and tamerlan tsarnaev at a gas station in cambridge where they drove with the owner of the suv they car jacked. one of them, investigators say, began by pointing a gun at the driver and saying, did you hear about the boston explosion? i did that. the car jacker showed the driver he had bullets in the gun and said, i'm serious. at the scene of the shootout in watertown where tamerlan tsarnaev was killed other explosives were found. in an interview for " dateline nbc " the police commissioner said he thinks the brothers planned other attacks.

>> we had to step over unexploded devices they threw at the officers. i can only understand from that that they had other targets. they were going other places.

>> reporter: both charges today carry the death penalty as a maximum sentence. it is a long way before p the justice department decides to seek it. if it did, he would be, by far, the youngest defendant in a federal death penalty case if modern times . brian?

>> pete williams starting us off in our washington newsroom. thanks,