Police: Rifle bought by mom used in Illinois school shooting

DIXON, Ill. (AP) — A teenager used a 9mm semi-automatic rifle in firing shots at a northern Illinois high school before he was shot by a school resource officer, police said Thursday.

Illinois State Police also said 19-year-old Matthew Milby's mother bought the weapon in 2012 and that investigators were working to determine how he obtained it.

Classes were canceled Thursday at Dixon High School, a day after authorities say Milby showed up in the morning as seniors met for a graduation rehearsal and fired several shots inside the building.

Milby, who was wounded in an exchange of gunfire with the officer, was transferred Thursday from a hospital to the Lee County Jail, the Dixon Police Department said.