TODAY   |  April 23, 2013

Boston bombing suspect drops backpack in video

The criminal complaint against Dzhokhar Tsarnaev, accused of using a weapon of mass destruction, is built on surveillance video, which shows him dropping a backpack near the finish line and walking away as the bombs go off. NBC’s Anne Thompson reports.

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>> the first time we're hearing about a possible motive at the deadly attacks at the boston marathon .

>> dzhokhar tsarnaev said they acted out of religious fervor and learned how to make bombs from the internet. we have overnight developments beginning with anne thompson in boston this morning, good morning to you.

>> reporter: good morning, savannah. the charge is using a weapons of mass destruction , the 19-year-old man from cambridge who is hospitalized with wounds to his hand, neck, legs and heads. the criminal complaint is built on surveillance video. at 2:38 president seven minutes later he drops his knapsack at the metal barrier, stays and uses his cell phone. when the first bomb goes off the complaint says every hand turns toward the explosion except tsarnaev. he appears calm and he walks away without his knapsack having left it on the ground where he had been standing. ten seconds later, for tsarnaev's dorm room at u mass . dartmouth the fbi seized a black jacket and white cap similar to what the man in the video wore plus bbs and large amount of pyrotechnics. one of the brothers pointed a gun at the driver and said, did you hear about the boston explosion? i did that. the victim escaped when they stopped at a convenience store. the s.w.a.t. team members who captured dzhokhar tsarnaev friday night spoke for the first time. jeff campbell pulled him off the boat.

>> we just want to get him into custody and have this situation come to an end for us, for the families, for the city, it needed to end.

>> reporter: monday night, boston university remembered graduate student lu lingzi, one of four killed in boston 's week of terror. krystle campbell was laid to rest, mourned by hundreds. the one-week anniversary of the bombing marked by a moment of silence. heads bowed across the city and the nation. yet it's the stories of kindness that keep people going. out of milk, she got this special delivery from a brookline police officer .

>> never imagined someone in their tactical gear carrying two gallons of milk down the street just so thoughtful.

>> reporter: the photo taken by her husband, just more evidence of how a small gesture can make a big difference. now today those who left their belongings in the chaos of the explosion can get them from the boston police and also, those who live on the section of boylston street that was closed by the bombings and those who work there, they can return to their places of work and the places where they live, but there is no word yet on when boylston street will be reopened for the public. matt in.

>> anne thompson in boston , thank