The surviving Boston bombing suspect is conscious and responding in writing to authorities, CBS News correspondent Bob Orr reports. Officials did not reveal further details on what they are asking or what his responses are.
Officials say Tsarnaev is recuperating from a bullet wound in the leg and in the neck, rendering him unable to speak. They could not comment on whether or not the second wound was self-inflicted.
Federal prosecutors are working on bringing charges but there was no immediate word on when Tsarnaev might be charged and what those charges would be. The twin bombings killed three people and wounded more than 180.
The most serious charge available to federal prosecutors would be the use of a weapon of mass destruction to kill people, which carries a possible death sentence. Massachusetts does not have the death penalty.
Investigators believe that two brothers suspected in the Boston Marathon bombing were likely planning other attacks based on the cache of weapons uncovered, the city's police commissioner, Ed Davis, told CBS' "Face the Nation" on Sunday. He said authorities found an arsenal of homemade explosives after Friday's gun battle between police and the two suspects.
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