UPDATE: BART trains began running again after a person on the tracks between two Oakland stations was taken into custody at 12:14 p.m., a BART official said.
BART trains stopped running Tuesday morning because of an unauthorized person on the tracks between the 12th Street Oakland City Center and West Oakland stations, a BART dispatcher said.
The person was reported on the tracks at about 11:10 a.m. between the two stations and has prompted trains to stop in both the San Francisco and East Bay directions.
Hundreds of passengers were forced to disembark at Embarcadero while BART police "chased the man on the tracks," according to a BART train operator.
BART ticket agents were marking Clipper Cards so passengers would not be charged for the truncated trip. Passengers were advised to take the Transbay Terminal bus to get to the East Bay.
Bay City News contributed to this report.