BOSTON, Mass. (WISH) - Dzhokhar Tsarnaev, the 19-year-old marathon bombing suspect, is now awake and communicating in writing with investigators.
He remains in serious condition at the same Boston hospital where 11 victims are still being treated.
Tsarnaev is recovering from bullet wounds to the leg and neck, which have made him unable to speak.
Investigators are questioning him about his role in the bombings that killed three people and injured more than 180 others.
Police won't say specifically what they're asking him or what his responses are.
They have, however, said that a special interrogation team is working to determine a motive.
Police have also said they believe Tsarnaev and his older brother were planning other attacks based on what they call an arsenal of homemade weapons that were found.
Over the weekend, a former neighbor of Dzhokhar Tsarnaev said he barely recognized the teen.
"How in the world did this happen?" asked George McMasters. "How could he have changed so much in the year, year and a half that I'd been absent? Go from a young man, polite, well spoke, friendly, engaging, typical American teenager to what I have to say is a monster."
Charges are expected early this week, but there's no word yet on what the those charges could be.
The most serious charge available to federal prosecutors is the use of a weapon of mass destruction to kill people.
The federal public defender's office said he will have a defense attorney as soon as possible because they're concerned about interrogation.
Massachusetts Gov. Deval Patrick said surveillance video from the Marathon shows Dzhokhar Tsarnaev dropping his backpack and calmly walking away before the bomb exploded.
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