BART police responded to reports of a gun sighting at about 8:30 a.m. at the Civic Center station, but officers were unable to find a firearm, spokesman Linton Johnson said.
The police activity caused delays of between 13 and 18 minutes for trains leaving from the station in the Millbrae, East Bay, and San Francisco International Airport directions, Johnson said.
All trains were running on time again as of 9:45 a.m., a BART dispatcher said.
