Via NBC News:

Boston bombing suspect Dzhokhar Tsarnaev was under heavy guard in serious condition Saturday morning — at the same hospital where victims of Monday’s bombing are still recovering.

Federal investigators were waiting to question Tsarnaev, 19, a naturalized U.S. citizen of Chechen origin, hoping to uncover a motive for horrendous attacks that bookended a week of terror.

The FBI confirmed that in 2011, it probed Tsarnaev’s older brother, Tamerlan, for possible extremist ties after a tip from a foreign country that he was a “follower of radical Islam” and planned to join an underground group. Agents grilled him and neighbors and did not find “any terrorism activity, domestic or foreign.” [...]

Dzhokhar Tsarnaev was being held at Beth Israel Deaconess Medical Center, where 11 victims were also being treated after two blasts tore through crowds at the finish line of Monday’s race.

He was wounded in the firefight with cops but escaped, sparking a daylong lockdown of Boston and surrounding towns. A door-to-door manhunt had just ended when a Watertown resident noticed blood on the tarp covering a boat in his backyard, peeked under and found the suspect, a relative told TODAY.

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