Service at BART's San Francisco International Airport station resumed just before 10:15 a.m. Wednesday after the station was closed for more than an hour due to a BART police investigation.
BART reported the closure just after 9 a.m. as officers investigated a "police matter" that began at 8:45 a.m., BART spokesman Jim Allison said.
The agency has yet to elaborate about the nature of the investigation, saying only that police were investigating a "suspicious circumstance." However, BART and San Francisco police officers have deemed the station safe for the public to use.
The SFO station was evacuated and trains were not entering or leaving the station. SamTrans offered bus shuttles between the SFO, Millbrae and San Bruno stations during the closure.