A widespread power outage hit Spain and Portugal, affecting millions of people who live across Europe's Iberian Peninsula.

It may take a week for the network servicing both countries to be fully repaired. Meanwhile, millions are without power.

Spain and Portugal are racing the setting sun as they respond to a massive, unexplained power outage that knocked out traffic lights, caused chaos on roads and in airports, and threatened to plunge tens of millions of people into darkness on Monday.