A major BART train service disruption Friday between the Hayward and Berryessa stations was caused by suspected vandalism that damaged wayside equipment, preventing trains from safely operating, according to officials with the transit agency.

The discovery came after BART officials earlier clarified that the disruption was not related to a computer network issue as messages from their system initially reported, but due to damaged trackside equipment.

BART provided details later Friday, saying the cause of the service disruption was “an apparent act of vandalism that resulted in fiber being cut near BART’s Hayward Yard. The fiber cut prevents BART from being able to safely run trains.”

“Ordinarily, BART is a reliable service despite those disruption services,” BART spokesperson Chris Philippi said. “Nonetheless, when there is a disruption like this, whatever the reason might be, it is extremely frustrating for us at BART because we want to get people where they need to go.”

Full service was restored just before 3 p.m.

BART is asking anyone with information about the vandalism to contact police.

BART halted train service between South Hayward and Berryessa stations early Friday morning due to suspected vandalized equipment, the transit agency said. Bob Redell reports.