The shooting occurred at about 7:50 p.m. at or near the station at 1451 Seventh St.
BART police are investigating the shooting and searching for a suspect who fled into the West Oakland neighborhood.
BART officials are described the male suspect as slim, 6 feet 3 inches tall, black, wearing a green hooded jacket, blue jeans and red and black boxer shorts. He also had on tan military-style boots and a backpack.
BART police took a man into custody that matched that description who may be connected to the fatal shooting.
Witnesses say a passenger was killed by another rider as the San Francisco-bound BART Train pulled into the West Oakland Station. Witnesses say they noticed a disheveled looking man get on the train at either Rockridge or MacArthur station.
As the train approached West Oakland Station, just before the doors opened, the disheveled man pulled a gun and shot a younger passenger who was seated next to the door, according to witness accounts.
One witness says he helped the victim to the floor and began giving the victim CPR. He said he noticed the victim had a knife in his hands. Another witness said she also helped give aid. Other passengers fled the scene.
The West Oakland station is closed and BART is providing limited service through the Transbay Tube tonight, according to BART officials.
Trains are not stopping at the West Oakland station.
Trains traveling on the San Francisco to Pittsburg Bay Point line are running their entire route.
Trains on the other line that travels through the Transbay Tube Saturday nights, the Dublin-Pleasanton to Daly City line, is having passengers transfer at the Oakland 12th Street City Center station.
Passengers who parked their cars at the West Oakland station can take Alameda-Contra Costa Transit District buses to the station from either McArthur station or the Lake Merritt station.
From the Lake Merritt station take the 62 bus and from McArthur station take either the 31 or 26 bus.
West Oakland Station closed and only limited transbay service due to BART Police investigation into fatal shooting.— SFBART (@SFBART) January 10, 2016
Trains are not stopping at WOAK due to police activity.— SFBARTalert (@SFBARTalert) January 10, 2016
Major delay at WOAK in SF and East Bay dirs due to police activity.— SFBARTalert (@SFBARTalert) January 10, 2016
Delay developing at WOAK in SF and East Bay dirs due to police activity.— SFBARTalert (@SFBARTalert) January 10, 2016
Stay with ABC7 News for the latest details on this developing story.