Parents shocked after son ID'd as bomber: 'We had no idea of the darkness' he was in

PFLUGERVILLE, Texas - Investigators detained and questioned two roommates of the Austin bombing suspect Wednesday as officials sought to determine whether Mark Anthony Conditt had any help as he terrorized Texas' capital city over the last month.

One of the roommates has already been released, while the other was still being questioned, Austin police said in a statement on Twitter, declining to release any names since no charges had been filed.

Officials also announced that late Tuesday they had filed a federal bomb-possession charge and arrest warrant against Conditt, shortly before he blew himself up early Wednesday following a brief police chase in the Austin suburb of Round Rock.

"Hundreds of federal, state and local law enforcement officers worked together to identify and locate Conditt," U.S. Attorney John F. Bash said in a statement. The affidavit supporting the complaint, which might