The Tennessee Bureau of Investigation now says the bullet that struck a Knoxville police officer inside Austin-East High School was not from the student’s gun.

The TBI added 17-year-old Anthony J. Thompson Jr. died after he was shot.

Police responded to the school Monday to a report of a student possibly armed with a gun. Officers located Thompson inside a restroom at the school. During a struggle, the student’s gun was fired. This was followed by officers firing twice.

The preliminary examination indicates the bullet that struck Police Officer Adam Willson was not fired from Thompson’s handgun. Willson, a 20-year veteran of the police department who serves as the school resource officer, is expected to recover after undergoing surgery.

The TBI did not release who shot Willson.

The investigation into the shooting is continuing. Findings will be shared with District Attorney General Charme Allen throughout the process.