CHICAGO (AP) — Chicago rapper Chief Keef has been taken into custody after a juvenile court judge decided a video of him firing a semiautomatic rifle at a New York gun range was a violation of probation.

The artist, real name Keith Cozart, was sentenced last year to 18 months' probation after his conviction on aggravated unlawful use of a weapon charges for pointing a gun at police officers.

The Chicago Sun-Times reports (http://bit.ly/VJ1YUt) Judge Carl Anthony Walker said the video showed a disregard for the court's authority. Walker scheduled a Thursday sentencing hearing for the 17-year-old Cozart.

Defense attorney Dennis Berkson told Walker his client never took the gun outside of the range and the target practice was supervised.

Chief Keef's first album, "Finally Rich," was released last year to mixed reviews.