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ROSEBURG, Ore. — Authorities say the gunman who killed nine people at an Oregon community college killed himself as officers arrived.

Sheriff John Hanlin made the disclosure Saturday at a news conference. He says the determination was made by the medical examiner’s office.

A timeline of the college campus shooting released by the sheriff shows police arrived at the scene six minutes after the first 911 call and exchanged gunfire with the shooter two minutes later.

The timeline released Saturday also shows the suspect was down two minutes after the shootout.

A Roseburg police officer and an Oregon state trooper were the first to arrive at the scene.

Armed with multiple guns, the shooter walked into an English class at Umpqua Community College on Thursday and opened fire, killing nine and injuring nine others.