A Florida teen was arrested after he allegedly stole an AR-15 and tactical gear from an unmarked Palm Beach Sheriff’s deputy’s vehicle, officials said Sunday.

A 17-year-old of Boynton Beach, flaunted the stolen weapons on an Instagram live stream as he danced to rap music.

The deputy reporting the items stolen to Boyton Beach police back on August 14. He left his unmarked cruiser parked at a shopping plaza for hours, according to the newspaper. He allegedly stole two loaded magazines, a gas mask, taser, ballistic helmet and rifle clips, police said.

The live stream he launched gave police ground for a search warrant. Detectives found the stolen items under the teen’s mattress, police said.

He faces grand theft and burglary with a firearm charges and was being held at a juvenile detention center.