An alert was sent out to riders Sunday that BART service was paused in the Transbay Tube due to communication issues, along with information on transbay bus lines, leading to long waits for shuttles throughout Sunday evening.

Transbay BART service resumed around 4:30 am Monday after crews worked through the night to repair cables that were damaged by a street-level fire in West Oakland, leading to a complete halt in service through the Transbay Tube.

As KPIX reports, BART has said that their equipment was not at fault in this case, but a fire that occurred on the street level near West Oakland Station damaged some vital communications cables. And NBC Bay Area had a subsequent report, via BART officials, that the fire occurred in an RV in a homeless encampment beneath or near the BART tracks.

BART first issued a service alert on social media around 4:15 pm Sunday, reporting a halt in service due to loss of communication in the Transbay Tube. This was followed up with information about taking AC Transit's F, O and N/L transbay bus lines, which transports riders from SF’s Salesforce Terminal to several East Bay stops.

According to BART’s advisory page, riders were also being directed to take a dedicated shuttle bus between the 12th Street Oakland BART station and the Salesforce Terminal in SF.

“We have crews working to restore that communication right now, but for now trains are turning back at Embarcadero Station in San Francisco and at the West Oakland station in the East Bay,” said Anna Duckworth, a BART spokesperson, in a statement.

Hundreds if not thousands of frustrated East Bay residents formed lines at Salesforce Transit Center Sunday evening to board crowded buses to get them across the Bay, following the surprise disruption. As KTVU reports, many riders arrived in downtown SF BART stations to hear the announcement, and then had to walk to the Transit Center to find buses — this came after some riders had already been waiting in stations for a train for over an hour.

"It's an inconvenience. I've been here for about three hours now," said one rider, Alvonda Meyers of Oakland, speaking to KTVU.

BART had also been running trains on a single track through the Tube late Saturday night due to previously scheduled work to install new lights, though this was unrelated to Sunday's incident.

Image: Pi.1415926535/Wikimedia

*This post has been updated throughout.