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The prime minister has said he is "deeply concerned" about the closure of Heathrow Airport as a result of a power cut caused by a fire at a nearby electrical substation.

The airport's chief executive, Mr Woldbye, has said a back-up transformer failed during the power cut, meaning systems had to be shut down before power could be restored.

"We're aware of a widespread power cut affecting many of our customers around the Hayes, Hounslow and surrounding areas," it added.

Many of those who had been in lifts inside the stations when the power cut happened had to be freed by firefighters.

According to Metro de Santiago, the evacuation of the underground was completed 90 minutes after the power cut - but disruption caused by the outage carried on for many more hours.