An underground vault in the Castaic area exploded and temporarily knocked out power to 1,700 customers.
An electrical failure was likely behind several manhole covers that were displaced in the San Fernando Valley, officials said Friday.
A Hazmat incident prompted the evacuation of a building and forced street closures in La Habra Friday morning.
Investigators were looking into possible causes behind an underground explosion near that left left traffic stalled and power shut down to local businesses.
A fire captain talked exclusively with KCAL9 News Monday about an explosion that literally blew him and a fellow firefighter off their feet in a terrifying close call that was caught on camera.