Spain and Portugal are reeling from a massive, unexplained power outage that knocked out traffic lights, caused chaos on roads and in airports, and prompted both countries to declare a state of emergency.

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.