An East Bay man was arrested in Mill Valley on Thursday with a trove that included guns, ammunition, a sword, a booby trap and a white plastic face mask, police said.

The arrest happened after a traffic stop at 2:30 a.m. at Miller Avenue and Almonte Boulevard. Mill Valley police Cpl. Michael Puccetti stopped the car because it had a malfunctioning headlamp, said Sgt. Shaun McCracken.

Puccetti noticed some of the suspicious items, searched the vehicle and found the rest of the stockpile. The booby trap was a device intended to hold a shotgun shell that would deploy if someone tripped the wire, McCracken said.

Police booked Zhanjian Zhang, 28, of San Leandro into the Marin County Jail on various weapons allegations. His bail amount is listed as $500,000.

Police are investigating why Zhang was in Mill Valley and whether he had plans to use the weapons.

While being booked at the jail, Zhang gave his occupation as table tennis instructor.

Source: www.mercurynews.com