OAKLAND -- A bomb threat against an AC Transit bus that forced the closure of the West Oakland BART station and kept thousands of commuters from crossing the bay was "unfounded," authorities said Tuesday evening.

The all-clear was sounded around 9:10 p.m. by Alameda County sheriff's Sgt. J.D. Nelson, himself also a member of the sheriff's bomb squad, and confirmed by an Oakland police lieutenant on Twitter. BART service through the Transbay Tube began around 9:10 p.m., though trains did not stop at the West Oakland station until about 9:25.

The threat was called in around 7:20 p.m., as the bus pulled up to the station and parked under the tracks at 7th and Center streets, Trost said earlier. The caller identified a specific bus, police said.

There were major delays throughout the system as no trains were running through West Oakland, a transfer point for all lines. No trains were running to or from San Francisco while the threat was investigated.

Trost said that there were reports of "very heavy crowding" at downtown San Francisco stations. AC Transit had sent nine extra buses to the San Francisco bus terminal to bring passengers back to the East Bay as of 8:45 p.m., she added.

Oakland police briefly advised residents and business owners to evacuate an area from 5th to 8th streets and from Mandela Parkway to Henry Street.

Heavy crowds were expected on BART for the "On The Run" tour with Beyonce and Jay-Z. That show was scheduled to begin at 8 p.m. at AT&T Park.


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Follow Kristin J. Bender at Twitter.com/kjbender.