Nightly News   |  May 03, 2013

FBI trying to verify Dzhokhar Tsarnaev's claims

Officials are saying that it is probably impossible to verify all the information that the Boston Marathon bombing suspect told interrogators. NBC's Pete Williams reports.

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This content comes from Closed Captioning that was broadcast along with this program.

>>> the bombing investigation out of boston. we are learning more tonight about how the suspects plan to carry out the attacks including the report they were planning to do on july 4 and not patriots day originally, and how one of them was killed in the days after the bombings. once again tonight our justice correspondent pete williams in our d.c. newsroom. pete, good evening.

>> brian, good evening. officials say it's probably impossible to verify everything that dzhokhar tsarnaev told his interrogators such as his claim they originally planned to attack on the fourth of july. authorities say he explained when they decided to do something earlier he and his brother were not focused on the marathon until they saw all the preparations and until then didn't realize they were planting one of the bombs near the finish line. investigators are asking more questions of tamerlan tsarnaev's widow katherine russell and say -- found on her computer but it is unknown if it was downloaded by her, her husband or brother. she said she was shocked by the bombing. and the department of homeland security is working to get information about student visas. one of dzhokhar tsarnaev's friends left for a visit to kazakhstan. when he returned the border agents didn't know his visa was suspended and he was allowed back in. tamerlan was run over by the car his brother was driving.