Fire crews responded Monday afternoon to a vegetation fire that broke out in an area southwest of Mount Diablo, officials said. It was unclear initially exactly where the fire began and whether any homes or commercial buildings were threatened. Fire crews from the Contra Costa Fire Protection District and Cal Fire had been called to the blaze.

A new wildfire was reported today at 2:36 p.m. in Stanislaus County, California. Diablo Fire has been burning on private land. There is no update on the containment progress of the fire and its cause remains unknown.

Crews are battling a brush fire in Contra Costa County on Monday, CAL FIRE said. The fire started around 12:06 p.m. southeast of Clayes Court and Stirling Drive in Rodeo, and burned at least 10 acres.