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The brothers accused of carrying out the Boston Marathon bombing were FRAMED ... this according their father, who probably doesn't know what he's talking about.

Anzor Tsarnaev just gave an interview to Russian TV ... insisting his children, Tamerlan Tsarnaev and Dzhokhar Tsarnaev were set up ... and had nothing to do with all of the terribleness happening in Boston.

"Someone framed them," he said ... "I don't know who exactly did it, but someone did."

Anzor continued, "Damn cowards, they shot the boy dead. There are cops like this."

When asked if he's spoken with Dzhokhar today, Anzor said his phone was shut off.

"I'm afraid for my other boy," he said ... "Maybe he'll be shot dead too ... and they will say well, he has weapons."