An Iraqi refugee living in Arizona is being held without bond as a security risk after he was arrested last week in connection with a bombing attack at a Social Security office.

No one was injured in the Nov. 30 explosion, which damaged the Social Security Administration office south of Phoenix, Ariz.

Abdullatif Aldosary was arrested after witnesses recorded the license tag off a car seen speeding away from the building. An indictment issued Wednesday charges him with the bombing and with possessing firearms despite a previous felony conviction.

Local police found Aldosary washing his 2003 Hyundai when they got to his home 14 miles from the Social Security office. One witness described seeing flames shoot from the car as it sped off, and an FBI bomb tech later found "thermal damage to the vehicle, which likely was caused by explosive material," wrote FBI Special Agent Carey A. Cooper in an affidavit.

Neither the indictment nor a preceding criminal complaint refers to any jihadist connection or motivation for Aldosary. Agents searching his home found a rifle and a Ruger semiautomatic handgun, along with hundreds of rounds. And, tucked behind a picture hanging in his study, they found handwritten notes about explosive materials and instructions from the Anarchists Chemical Cook Book.