Boston bombings suspect Dzhokhar Tsarnaev conveyed to investigators that no international terrorist groups were behind the attacks, a U.S. government source told CNN's Jake Tapper.
Dzhokhar Tsarnaev indicated his older brother, Tamerlan, was the driving force behind the attacks and wanted to defend Islam from attack, the source said.
The 19-year-old was "alert, mentally competent and lucid," U.S. Magistrate Judge Marianne Bowler found during a brief initial court appearance in Tsarnaev's hospital room. During the hearing, he communicated mostly by nodding his head.
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