Photos show the impact of a massive blackout across Spain, Portugal, and parts of France

• A massive power outage hit Spain, Portugal, and parts of France on Monday.
• Trains, airports, and businesses were disrupted, while a major tennis event was stopped.
• Pictures from Spain show deserted stadiums and metro stations amid the blackout.

Millions in Spain, Portugal, and parts of France were hit by a massive power outage on Monday.

The blackout, which hit most of the Iberian Peninsula, began was first reported around lunchtime local time.

In an X post, Spain's grid operator, Red Eléctrica, said the causes of the blackout were being analyzed, and all resources are being dedicated to solving them.

In a follow-up post, Red Eléctrica said that parts of the south and north of the peninsula are recovering power as of 1 p.m. local time, and that it continues to work on restoring full service.

The operator estimates that it will take between six and 10 hours to restore the entire power, per the Spanish news agency EFE.

Meanwhile, Spain's National Cybersecurity Institute is investigating whether the blackout could have been caused by a cyberattack, according to local media reports.

The blackout halted operations at train stations, airports, businesses, and major buildings across affected areas.

In Barcelona, shoppers visited grocery stores in the dark

The metro system in Spain's capital Madrid was shut down and evacuated after the outage began

Play was halted at the Madrid Open, one of the highlights of the clay court tennis season

With little prospect of any more play, fans were sent away from the venue in Manzanares Park

Fans streamed out of the exits into sunny, 70 degrees Fahrenheit weather

This is a developing story. Please check back for updates.