There is a 20-minute delay on the Berryessa Line in the Berryessa, Richmond and Daly City directions due to police activity at the South Hayward station, BART officials said Saturday morning.
The delay was announced at 9:15 a.m. Saturday.
Wet weather conditions are also causing systemwide delays of up to 10 minutes, according to a BART advisory.
More information is not currently available. This story is developing.