A San Francisco man was arrested in connection with a traffic stop in the Presidio in which police reportedly discovered incendiary devices in the man's vehicle, according to Alexandra Picavet, spokeswoman for the Golden Gate National Recreation Area.
The vehicle was pulled over by U.S. Park Police in the 900 block of Mason Street just after 9 p.m., Picavet said. The driver told police he had fireworks in his car.
Park police thought the devices looked suspicious and called the San Francisco Police Department's Bomb Squad to assist in identifying "the true nature of the items the suspect handed over," Picavet said.
Two nearby businesses were evacuated for safety reasons, the House of Air and Planet Granite, and the road was closed.
The bomb technician wasn't able to identify the explosive device but said it had the potential to explode. The bomb squad moved the device to a safe location and detonated it around 1:15 a.m.
The man was arrested on suspicion of possessing illegal substances when marijuana was allegedly found in his vehicle, Picavet said. She did not know the man's name.
He was later released, she said.
More charges in connection with the explosives found in the vehicle are pending, Picavet said. Both the San Francisco Police Department and U.S. Park Police are investigating the incident.
Bay City News contributed to this report.