See photos of the massive power outage that affected millions of people in Spain and Portugal due to an "induced atmospheric vibration."

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.

The massive power cut that stranded Mr Hughes triggered chaos across Spain and Portugal, and also impacted Andorra and parts of France, from about midday local time (10:00 GMT). Traffic lights shut off. Metros closed. Businesses shuttered and people joined queues to get cash as card payments did not work.