This courtroom sketch by artist Jane Flavell Collins shows defendants Dias Kadyrbayev, left, and Azamat Tazhayakov appearing on May 1, 2013, in front of Federal Magistrate Marianne Bowler at the Moakley Federal Courthouse in Boston.

BOSTON - Two friends of the suspected Boston Marathon bomber have been indicted on federal charges of conspiracy to obstruct justice.

Dias Kadyrbayev are accused of trying to dispose of evidence from Dzhokhar Tsarnaev's dorm room. The two have been detained since they were initially charged in May.

Tazhayakov's attorney said Thursday his client did nothing wrong, and authorities are on a witchhunt.

Kadyrbayev's attorney said his client never knowingly disposed of evidence and he was horrified someone he knew was involved in the bombings.

Also Thursday, a hearing scheduled for Monday for a third Tsarnaev friend charged in the case, Robel Phillipos, was canceled. Phillipos is accused of lying to investigators. His attorneys say they're in talks that could resolve the case.