Bay Area Rapid Transit issued an alert advising passengers that trains were operating at reduced speeds while crews carried out track safety inspections. The agency warned of delays of up to 20 minutes across the system.

A preliminary 2.9 magnitude quake was recorded close to San Ramon Monday afternoon, according to the U.S. Geological Survey.

The earthquake struck at a depth of 5 miles, with its epicenter approximately 3 miles southeast of San Ramon.