Magnitude 3.9 earthquake jolts the East Bay

A magnitude 3.9 earthquake rattled the Bay Area Monday evening. 

According to the United States Geological Survey, the temblor struck near San Lorenzo around 6:29 p.m. The earthquake was first reported as a magnitude 4.2 but downgraded to a 3.9.

There were no reports of danger or injuries. The shaker was felt in Oakland, Danville, Walnut Creek, and San Francisco.

KTVU's Chief Meteorologist Bill Martin says the earthquake was along the Hayward fault line at about five miles deep. 

BART trains recovered from a 20-minute systemwide delay as tracks were inspected.