Thirteen climate change activists are in custody after chaining themselves to railings on the north runway at Heathrow Airport.
Activists from campaign group Plane Stupid said demonstrators gained access to the runway at 3.30am after cutting a hole in a fence. The protest forced the cancellation of some flights.
Heathrow could launch legal action against climate campaigners who caused serious disruption to the airport after chaining themselves to railings on the north runway.
Thirteen of the activists have been arrested and are being held in custody, the Metropolitan Police confirmed.
The members of activist group Plane Stupid had cut a hole in a fence in the early hours of Monday morning and lay down on the tarmac to protest against airport expansion.
They were later cut free and removed by police.
A Heathrow Airport spokesman said: "The safety of our passengers and the smooth running of the operation is paramount. Anyone who breaks the law and interferes with the safe operation of the airport can expect to face legal action."
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