The man who gunned down nine people at an Oregon community college delivered a box to a survivor during the shooting, a victim said.

Stacy Boylan, whose daughter Anastasia was injured in the shooting, said she told him the gunman "gave somebody a box, somebody who lived, and said, 'You gotta deliver this.' "

Boylan said he doesn't know what was in it.

"Somebody has a box. I don't know what that's about," he said.

The shooting at Umpqua Community College in Roseburg left nine people dead and nine more injured on Thursday.

Authorities confirmed the shooter, identified as Chris Harper-Mercer, handed out something during the shooting.

He gave his writings to a survivor and told the person to give them to police, law enforcement officials familiar with the investigation said. They could not confirm whether the writings were in a box.

The writings portrayed the shooter as identifying with perpetrators of past shooting rampages, investigators said, including Elliot Rodger, who killed six people last year in Santa Barbara, California.

Harper-Mercer expressed frustration that other mass killers did not take on police and vowed he would kill them along with others, law enforcement officials said.