BART was recovering Monday night after a suspicious package shut down the Hayward station for about three hours during the peak of the Monday evening commute, BART officials said.
The service disruption was reported on Twitter at 4:42 p.m, and trains began rolling through the Hayward station again a little before 8 p.m.
BART spokesman Jim Alison said the station remained closed, with no through service, as BART police investigated.
Alison said trains traveling south were turned back at the Bay Fair station, and trains traveling north only went as far as the South Hayward station.
BART officials told passengers who needed service through Hayward to take the Alameda-Contra Costa Transit bus service.