The country’s top officials are trying to figure out the cause of a power outage that stranded tens of millions of people across the Iberian Peninsula.

On Monday morning, millions of people across the Iberian Peninsula lost power. The cause of the outage is yet to be determined.

A blackout brought much of Spain and Portugal to a standstill Monday, stopping trains, cutting phone service and shutting down traffic lights and ATMs for millions of people across the Iberian