UPDATE, 3 p.m. EDT: Authorities increased the number of injured to at least 100 and said there was widespread damage to downtown Napa as a result of the early morning quake, the San Francisco Chronicle reported. A triage tent was set up in the parking lot behind the emergency room at Valley Medical Center to assess the injured. A broken water main forced firefighters to improvise to put out a blaze that damaged four trailers at a mobile home park.

UPDATE, 12:49 p.m. EDT: California Gov. Jerry Brown declared a state of emergency in the aftermath of the magnitude-6.1 earthquake that struck the region early Sunday. Brown’s proclamation came shortly after the city of Napa declared a local emergency and appealed for state assistance with the damage caused by the quake.

Original Story: 

The magnitude-6.1 earthquake rocking the Napa Valley area in Northern California early Sunday injured at least 87 people, the Los Angeles Times reported, and caused flooding and roadway damage across Napa, local ABC7 News said. Meanwhile, as many as 50,000 customers of the Pacific Gas and Electric Co. unit of the PG&E Corp. (NYSE:PCG) may be affected by power outages caused by the quake.

Emergency services have been activated to deal with the repercussions of the earthquake, Gov. Jerry Brown said in a statement. “My Office of Emergency Services has been on full activation since early this morning and is working closely with state and local emergency managers, first responders and transportation officials to respond to impacts to residents and critical infrastructure,” Brown said. “These public-safety officials are doing all they can to help residents and those living in affected areas should follow their guidance and instruction.”

The earthquake, hitting the region at around 3:20 a.m. PDT (6:20 a.m. EDT), is the strongest to strike the region since the Loma Prieta earthquake of 1989. The U.S. Geological Survery originally reported its magnitude as 6.0, but revised it based on incoming information. Sunday’s earthquake occurred just weeks before Loma Prieta’s 25th anniversary in October.