The suspect, identified as Kyle Matthew Folsom, 37, was taken into custody around 5 p.m. as the agents conducted an investigation near the former site of the demolished Candlestick Park sports stadium, KNTV-TV of San Francisco reported.
It was unclear how Folsom came to the attention of the FBI.
San Francisco firefighters and personnel from the city’s explosive ordnance disposal unit accompanied the FBI agents at the scene, the station reported.
Nearby residents evacuated the area as the law enforcement action was underway, the report said.
Folsom was booked on charges of suspicion of unlawful possession of explosives, reckless or malicious possession of a destructive device and possession of material to make a destructive device or explosive, police told the station.