The lone surviving suspect in the bombing attack on the Boston Marathon one week ago is communicating in writing, and could be ready to be questioned by an elite FBI team.
As Boston prepared to mark with a moment of silence the passing of a week since the terror attack that killed three and wounded at least 176, Dzhokhar Tsarnaev was believed to be unable to speak but awake and responding to questions, possibly from medical staff. Tsarnaev is under heavy guard at Boston's Beth Israel Deaconess Medical Center, and is in serious condition with several injuries, including a possible gunshot wound to the neck.
USA Today reported that the suspect began answering "substantive" questions from authorities Sunday night, but that could not be independently confirmed. If the interrogation has indeed begun, prosecutors may have just 48 hours before he must be read his Miranda rights and granted the right to remain silent and to have an attorney.
Investigators believe the throat wound that left the 19-year-old suspect unable to speak may have been self-inflicted in a failed suicide bid that may have come as police closed in on him, as he hid inside a boat trailered in a backyard in Watertown, Mass., late Friday.
U.S. Senate Intelligence Committee member Dan Coats, R-Ind., told ABC Sunday the injuries may leave the suspect permanently unable to speak.
"The information we have is that there was a shot to the throat," Coats said. "And it's questionable whether -- when and whether -- he'll be able to talk again."
Meanwhile, Massachusetts Gov. Deval Patrick has asked residents to observe a moment of silence at 2:50 p.m. Monday, the time the first of two bombs exploded near the finish line.
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