Massive outage in US Southwest and Mexico

A massive power outage leaved more than two million people without electricity in the US states of California and Arizona, and in neighbouring Mexico, BBC reports.

Five million people were without power on Thursday, with many likely to remain out of service for another day or two.

There was traffic chaos. California's two nuclear reactors were forced to shut down. San Diego was the worst affected city, and all outbound flights from the city's airport were cancelled.

Extreme heat is believed to have been a contributing factor, officials said.