She said anyone who knowingly possesses or conceals the stolen art could still face charges, but said prosecutors are willing to discuss potential immunity deals to get the artwork back.

NPR: FBI Focuses On Recovering Art Stolen In Mass.

The warrant said she "intentionally and knowingly" caused the deaths and accused her husband of being the trigger man.

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Ms. Terry said she didn't believe Mr. Phillipos would knowingly cover up anything related to the bombings.

WSJ: Heritage Linked Boston Suspect, Students