Spanish power distributor Red Eléctrica said that restoring power fully to the country and neighboring Portugal could take 6-10 hours.

A massive power cut hit large parts of Spain and Portugal on Monday, causing widespread chaos and disruption. The outage left millions of people without electricity, while internet and phone networks were also down.

BARCELONA, Spain (AP) — A major power outage in Spain and Portugal has knocked out subway networks, traffic signals and ATMs. Spanish power distributor Red Eléctrica said restoring power to large parts of the country could take 6-10 hours. The company declined to speculate on the causes of the blackout Monday.