Police and the FBI are investigating after a man was stopped Wednesday driving a stolen truck packed with weapons, Molotov cocktails and body armor near the University of Washington.

Police stopped the truck at 10:30 p.m. in the 3400 block of Sand Point Way Northeast after a UW officer determined the truck had been reported stolen out of Montana. The driver of the truck, a Nevada resident, was arrested without incident and booked him into King County Jail.

According to a Seattle Police statement, investigators found a scoped rifle, a shotgun, suspected incendiary devices — bottles filled with flamable liquid — and body armor inside the truck, which was reported stolen from Butte, Mont. Police contend the firearms had also been stolen.

Speaking Thursday afternoon, UW Police Chief John Vinson said investigators don’t know why the 21-year-old was in Seattle, and that there is no indication he planned violence.