The British-born gunman who murdered nine people at an Oregon community college before killing himself ranted about not having a girlfriend and thinking everyone else was “crazy”, a source close to the investigation has said.

The gunman who opened fire in an Oregon college shot one classmate after saying he could save her life if she begged, and others were killed after being told to crawl across the floor, according to relatives of students in the classroom.

A gunman who killed nine people at a college in Oregon in the US may have been an IRA supporter.