ROYAL OAK, Mich. -

Safety concerns about an Insane Clown Posse concert in Royal Oak has resulted in a change of venue.

The ICP was scheduled to perform at the Royal Oak Music Theatre on Halloween, but the Police Department asked the theatre’s management to cancel the concert.

“Our concern is based on the number of concerts, throughout the country, in which ICP followers have created significant problems for local police departments,” Royal Oak Police Lt. Thomas Goad wrote in a memo, which was obtained by Local 4.

READ: Royal Oak police memo

Goad went on to explain that ICP followers, known as “Juggalos,” are classified as an organized gang by the FBI. He also said extra police had to be called in for an ICP concert a few years ago when they performed in Ferndale.

The concert has been moved to the Fillmore in Detroit.