Major power outage in California, Arizona, Mexico

LOS ANGELES - At least 1.4 million customers were left without electricity on Thursday after a major power outage in sweltering southern California, Arizona and Mexico, officials said.

San Diego Gas & Electric (SDGE) said an incident in the network between Arizona and California had caused the outage, which also affected neighboring Mexico and could continue into Friday.

"1.4 million of our customers are currently without power," the company tweeted, adding: "An event happened between AZ and CA. Both major connections to our region have been lost.

"This outage has affected Mexico and Baja," it said, referring to Baja California, the Mexican peninsula stretching south from below San Diego, below the US-Mexican border.

"This could go into tomorrow in some areas," it warned.

APS, the Arizona power supplier, said 56,000 customers had been affected.

Temperatures have been sweltering in recent days in southern California, boosting use of air conditioning. "Hot days in a row like we have had create lots of power flowing. Could have had an impact," SDGE tweeted.