Police: Austin bomber's motive still unknown, despite video

A 25-minute cellphone video left behind by the bomber whose deadly explosives terrorized Austin for weeks details the differences among the weapons he built and amounts to a confession, police said. But his motive remains a mystery.   

Roommates of Austin bomber questioned by authorities

UPDATE: The second roommate that was questioned has been released, according to the Austin Police Department. Their names are not being released because they are not under arrest at this time.

What we know about the Austin bombing suspect

Mark Anthony Conditt, 23, has been identified as the suspect in a string of recent explosions in Central Texas by a law enforcement official who spoke to the Associated Press.