Police: Oregon Mall Shooter Used Stolen Rifle

Police and medics work the scene of a multiple shooting at Clackamas Town Center Mall in Clackamas, Ore., Tuesday Dec. 11, 2012. A gunman is dead after opening fire in the Portland, Ore., area shopping mall Tuesday, killing two people and wounding another, sheriff's deputies said. (AP Photo/Greg Wahl-Stephens)
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PORTLAND, Ore. (AP) - Police say the gunman who killed two people and himself in a shooting rampage at an Oregon mall was 22 years old and used a stolen rifle from someone he knew.

Clackamas County Sheriff Craig Roberts says that Jacob Tyler Roberts had armed himself with an AR-15 semiautomatic rifle and had several fully loaded magazines.

Roberts says the rifle jammed during the 22-year-old's attack, but he managed to get it working again.

The chief says authorities don't yet have a motive.

A U.S. law enforcement official has told The Associated Press the shooter did not have a criminal record. The official spoke on condition of anonymity because he was not authorized to discuss details of an ongoing criminal investigation.

Two people were killed, and another was wounded.