Update 12:46 p.m.
The Colma BART station has finally reopened and no train delays are being reported. No word on what exactly happened to the victim. Luna Salavar, spokeswoman for BART, could not confirm whether or not this was a suicide.
"I cannot confirm if a man jumped in front of a train because I wasn't given that information by our Police Department," Salavar told us. "I can confirm a fatality at Colma due to a person being hit by a train, but I was not given a gender, nor was I informed that he/she jumped on to the tracks in front of a train."
Local commuter Amelia Hansen says she was at the station at about 9:15 a.m. when local police, BART employees, and emergency workers arrived at the platform, and people were still inside the stopped train. One of the train cars was separated from the others, as emergency crews brought ladders onto the platform. Eventually, the doors were opened and people were cleared from the platform.
Police began interviewing an eyewitness shortly after that.
Update 10 a.m.: BART spokesman Jim Allison says the medical emergency started at about 9:06 a.m. when an unidentified person was found under a BART train. The coroner has arrived at the scene, but the station is still closed and commuters are being rerouted to Daly City and South City stations.
Original story 9:40 a.m.: The Colma BART station on the Peninsula has been closed due to a major medical emergency, BART officials are reporting.
We're still trying to get details at this time, however what we can tell you is that there are 15-minute delays on the Daly City Line in the SFO, Millbrae, Daly City and East Bay directions.
In other words, time to find another way to the airport.
Luna Salaver, spokeswoman for BART, says passengers headed to San Francisco or the East Bay should use the Daly City station and if you're headed to the South Bay, consider using the South San Francisco station.
No word on when the Colma station will reopen.
We'll tell you more when we know more.
SF Weekly's Joseph Geha contributed to this report