11/17/2009 05:12 am ET | Updated May 25, 2011

FBI Terror Investigation: Agents Raid Two Denver Houses, Take Suspect In For Questioning

Federal investigators released an Aurora man late Wednesday night after 8 1/2 hours of questioning in connection with a multi-state anti-terrorism investigation.

Najibullah Zazi, 24, left the Byron G. Rogers Federal Building after 10:30 p.m. -- but is scheduled to return this afternoon for another round of questioning, according to his attorney, Art Folsom.

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