The Spanish grid operator has ruled out a cyber attack as the cause of a massive power cut that crippled Spain, Portugal and parts of France on Monday. Red Eléctrica's operations director Eduardo Prieto said preliminary findings suggest "there was no kind of interference in the control systems" to imply an attack,

Electricity had been restored to most of Spain and Portugal early on Tuesday after huge nationwide blackouts, although authorities were still trying to find out what caused the sudden outage.

Much of Spain’s power grid was operating normally on Tuesday, a day after a blackout affected critical infrastructure across the Iberian Peninsula.