Federal prosecutors have charged a Massachusetts man with obstructing the investigation into the Boston Marathon bombings. Prosecutors say 23-year-old Khairullozhon Matanov of Quincy is charged with destroying, altering and falsifying records in a federal investigation, and with making false statements in a federal investigation.

Authorities say that in the days after the April 2013 bombings, Matanov realized the FBI would want to talk with him because he knew the suspects and shared their ``philosophical justification for violence.''

He's accused of deleting information from his computer and lying to investigators. He's not accused of playing a role in the bombings or knowing about them in advance.

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