HOLLIDAYSBURG, Pa. -- An auxiliary officer for a local police department was killed when a machine gun discharged at a private gun show in Blair County.

Michael Kurty, 36, of Hollidaysburg, was killed Wednesday night during a gun expo at the Hollidaysburg Sportsmen's Club.

Police said a Gatling mini-gun attached to a Humvee fired a few thousand rounds earlier in the evening before it discharged and released a fatal shot to Kurty's head.

""What appears to have happened is there was some sort of a jam and when they were trying to clear the jam is when the gun actually went off," said Pennsylvania State Police trooper Jeff Petucci.

A military official was expected to disarm the Humvee on Thursday.

Officials said Kurty was proficient in all types of firearms and conducted training for many local police departments.

The incident remains under investigation. Stay with Channel 6 News and WJACTV.com for continuing coverage as details become available.