From BBC News.

Counter-terrorism police are leading the investigation into the cause of a fire that led to London’s Heathrow Airport closure, the Met Police has said.

There is no indication the fire was caused by foul play, the Met Police said in a statement, but added it is keeping an open mind at this time.

Heathrow, Europe’s busiest airport, will be closed all day Friday after the fire at a nearby electrical substation that supplies it with power.

The fire is still burning, London Fire Brigade has said.

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