PORTLAND, Ore. (AP) — The mother of a gunman who killed nine people and himself at an Oregon community college allowed her troubled son to have guns and acknowledged in online posts that he struggled with autism, but she didn't seem to know he was potentially violent. The online writings by Laurel Harper date from a year ago to nine years ago and offer fresh insight into the gunman, 26-year-old Christopher Harper-Mercer, and his relationship with his mother.