(KRON) -- BART has halted service in the Transbay Tube on Sunday afternoon due to "loss of communication," the agency posted on X at 4:19 p.m. Trains are turning back at the West Oakland and Embarcadero stations. BART is working with local bus transit agencies for riders to safely reach their desti nation, officials said. AC Transit is providing a bus bridge, according to 511 SF Bay. As of 4:30 p.m., there is no known cause of the incident. Newsom signs $590 million loan to help Bay Area transit Close-up of a BART train car, August 20, 2024. (Photo by Smith Collection/Gado/Getty Images) BART first tweeted about the incident in an X post at 4:15 p.m. No other information was immediately available. For guidance on alternative methods of travel amid the Transbay Tube closure, check out BART's page on its website. KRON4 reached out to BART for more information. We did not hear back in time for publication. This is a developing story. ...read more read less