TODAY   |  April 22, 2013

Interrogation of Boston bombing suspect begins

Federal prosecutors plan to file terrorism charges today against Dhokhar Tsarnaev the younger of the accused Boston Marathon bombers, who is still hospitalized for a possibly self-inflicted gunshot wound to the throat. He’s being questioned for brief periods. NBC’s Pete Williams reports.

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

>> tsarnaev cannot use his voice to survive because of the gunshot wound to the throat, but we're told he is responding to some questioning in writing but that questioning is being kept very brief.

>> we can tell you authorities are pressing him for information on the attack. of course, the primary concern right now, did he and his brother have any help.

>> of course, this is one week after the bomb blasts at the boston marathon . massachusetts governor deval patrick is calling for a moment of silence today at 2:50, the time of that first explosion, and a private funeral today will be held for 29-year-old krystle campbell. while a memorial service is planned on the campus of boston university tonight for 23-year-old graduate student lingzi lu.

>> so where does the investigation stand? let's get right to nbc's justice correspondent, pete williams . he has new information on that investigation. pete, good morning.

>> matt, good morning. law enforcement officials say they have begun their interrogation of dzhokhar tsarnaev, but not in the way they had planned. they say he has a hard time speaking with a gunshot wound to the throat. federal prosecutors plan to file terrorism charges today against the younger of two brothers accused of planting bombs at the boston marathon . dzhokhar tsarnaev lies under guard at a boston hospital with a bullet wound in his throat. some investigators say it might be the result of a suicide attempt on friday night as he lay in a boat on a backyard trailer in watertown just before he was arrested. he's now being questioned for only brief periods, officials say, because of his medical condition , and he's responding mostly in writing because he has a hard time talking. officials say today's bombing charges will include a description of a still unreleased fbi video. according to those familiar with what it shows, dzhokhar tsarnaev can be seen removing his backpack at the spot where the second bomb was placed, and acting very differently from those around him when the first bomb blew up.

>> this suspect took the backpack off, put it down, did not react when the first explosion went off, and then moved away from the backpack in time for the second explosion.

>> federal officials say in the hours after the fbi released photos of the bombing suspects thursday night, investigators had not yet matched any names to their pictures and, in fact, did not have the tsarnaev brothers in any terrorist data base . only after the older brother was killed in the late night shootout in watertown were agents able to check his fingerprints and put actual names to their case. fbi agents are seeking to interview all the family members and friends of the two brothers, including the twiwife of the older one, tamerlan. her lawy the lawyer is talking to federal authorities about how to proceed. matt?