Update: Transbay BART service has resumed after being suspended for nearly an hour.

About 1 p.m., police detained the person who reportedly went onto the tracks in Oakland.

BART officials said service was stopped around noon. Trains were halted at San Francisco’s Embarcadero station and at the West Oakland station. Because of the activity, electricity to the trackway had to be turned off.

There were systemwide delays of up to 30 minutes after the issues was resolved.

The incident is under investigation, and it was not immediately known why the person was on the tracks.

Transbay BART service has been suspended this afternoon following reports that a person walked onto the tracks in Oakland.

According to BART officials, the report came in just after noon. As a result, all trains between San Francisco and West Oakland are being held. There is no estimated time as to when service will be restored. Riders should expect major delays.

akoskey@sfexaminer.com