The cause of the power outage that severely disrupted life in Spain and Portugal on Monday remains a mystery as service was brought back to the Iberian Peninsula.

A massive power outage has knocked out electricity across parts of Spain and Portugal, shutting off traffic lights and causing chaos at airports, train stations and on the roads. Follow for live updates.

A massive power outage appears to be affecting large portions of Spain and Portugal Monday. Red Electrica, the operator of Spain's power grid, said early Monday morning it had begun its plan to restore electricity and that the cause of the outage was being analyzed. "All resources are being dedicated to solving it," the agency said on X.