A man wearing only shorts was arrested at Livermore National Laboratory on Monday afternoon for allegedly stealing a campus truck.

According to Art Rosas, a spokesperson for the Livermore Police Department, LPD officers noticed the truck in Pleasanton, California, because it was driving erratically. When the officers used the emergency lights on their unmarked police car to order the vehicle to stop, the suspect drove faster. Officers then began a vehicle pursuit, Rosas said. One unmarked car chased the suspect in Pleasanton and was later joined by other marked police cars in Livermore.

During the pursuit, the suspect threw a fire extinguisher at the unmarked police car but failed to hit it, Rosas said. The suspect also braked firmly, causing the police car to crash into the truck. According to Rosas, the suspect later told officers that he had hoped that the police car’s airbags would be activated from the crash and prevent the officers from continuing the chase. But the crash was not hard enough to deploy the airbags, Rosas said.

The suspect also voluntarily took off his shirt and gloves during the pursuit. According to Rosas, the suspect later told the police that he stripped to show them that he was unarmed.

Rosas said the car chase continued from Pleasanton onto the highway and into the city of Livermore, California, where the suspect decided to end the pursuit at Livermore National Laboratory.

According to Rosas, the suspect told officers that he stole the truck because he thought that somebody was chasing him.

Rosas said the suspect is an Oakland transient who also has a history of drug use and mental illness.

As of Thursday evening, the suspect was being held in custody.

Contact Charlotte Kosche at [email protected] and follow her on Twitter at @CharlotteKosche.