Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon attack, told federal investigators today that his brother, Tamerlan, was largely behind the bombing, CNN reported this evening.

CNN -- which erroneously reported Wednesday that an arrest in the case had been made -- cited a U.S. government source.

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The network reports that:

Preliminary interviews with Dzhokhar Tsarnaev indicate the two brothers fit the classification of self-radicalized jihadists, the source said. Dzhokhar Tsarnaev, wounded and held in a Boston hospital, said his brother wanted to defend Islam from attack, according to the source.

That source also told CNN that Dzhokhar that they planned the attack themselves without any outside help. The source said that the government continues to try and independently verify Dzhokhar's account.

Earlier today, it was reported that Dzhokhar was writing down answers to questions from investigators. He was charged Monday with "using and conspiring to use a weapon of mass destruction."