Authorities were investigating a rush-hour power blackout in parts of Southern California, Arizona and Mexico on Thursday that left more than 1 million customers without power and caused widespread traffic jams.
San Diego Gas & Electric said all its 1.4 million customers were without power. The problem appeared to have originated in Arizona, the utility said.
Power outages in California on Thursday stretched from San Clemente to the state's border with Mexico, a San Diego County spokesman told CNN.
The cause of the blackout was unclear. The San Diego utility said greater power usage during hot weather could be responsible.
"This is crazy, gridlock everywhere," Brian Korhummel told CNN's iReport.
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