Actor Johnny Knoxville, star of the former MTV show Jackass, was detained by Airport Police Thursday, January 15th, after he was allegedly found to have an inert hand grenade inside his luggage at Los Angeles International Airport (LAX).

Knoxville, whose legal name is John Philip Clapp, was stopped by Airport Police as he was about to board a 7 a.m. American Airlines flight to Miami, said Sgt. Jim Holcomb, Airport Police spokesman.

Knoxville was processing through passenger security screening when a Transportation Security Administration officer saw the image of a hand grenade in the actor’s carry-on bag, Holcomb said.

Airport Police and the Los Angeles Police Department Bomb Squad were called to the scene and determined that the hand grenade had no explosives or firing pin.

Knoxville, 38, of Malibu, told Airport Police that the hand grenade was a prop from one of his photo shoots and he had forgotten the item was in his bag, Holcomb said. Following the investigation, Knoxville was released and allowed to board the plane.

Airport Police said an application for a criminal complaint was expected to be filed with the Los Angeles City Attorney’s Office for misdemeanor possession of a prohibited item within the sterile area of an airport.

Knoxville was detained only days after three separate motorists were detained by Airport Police for traveling onto airport property with weapons during routine vehicle inspections at LAX.