TODAY   |  April 28, 2013

Boston suspects’ mother was placed on FBI list

Authorities have confirmed the mother of Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev was placed in a U.S. terror database in the fall of 2011. NBC’s Michelle Franzen reports.

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>>> we begin with the latest on the boston marathon bombing investigation. new information coming to light about the actions of the suspects and their mother. nbc 's michelle franzen is live in boston to tell us more about that. michelle, good morning.

>> reporter: well, good morning, lester. u.s. officials tell nbc news that they are looking for evidence on the suspects here at home, but also following up on leads overseas. authorities have been operating on the theory the suspects acted alone, but also say they are not ruling anything out. investigators say they are still looking into all possibilities in the boston bombing case, including tracking possible leads on the two bombing suspects here at home and overseas. authorities confirmed the brothers' mother was placed on a u.s. government terrorism database 18 months before the bombings because of her son, tamerlan. the list consists of hundreds of thousands of names, but being added to the list doesn't mean proof of terrorist activity . a u.s. official tells nbc news russian authorities passed along information to the cia, stating both tamerlan and his mother were showing signs of increasing radicalization.

>> they are already talking about that we are terrorists. i am terrorist.

>> reporter: accusations the mother denied. meanwhile, nbc news has learned that although early accounts focus largely on the stolen suv , investigators are also focusing on a second vehicle, a green honda used by the bombing suspects on the day of the manhunt and fatal shooting of m.i.t. officer sean collier in cambridge. in an affidavit, federal authorities say the suspects carjacked a vehicle. police say a mercedes suv following the shooting, when they were riding together during the chase that ended in watertown. but in photos obtained by nbc news and eyewitness accounts, a green honda was also spotted at the scene in watertown along with the black suv .

>> thank you. i appreciate it.

>> reporter: in copley square saturday, bombing survivor leann yanni was released from the hospital and didn't let her leg injury keep her from visiting the makeshift memorial.

>> it's amazing. and i appreciate it so much. i feel like i can speak for a lot of the victims how much we truly appreciate all this support.

>> reporter: and leann says she hopes to run again. meantime, an update. nearly two weeks after the bombing took place, victims -- 30 of them -- remain in boston hospitals. one still in critical condition. lester, erica?

>> michelle franzen with our update from boston this morning. thanks very much.