Climate change activists disrupted flights at Heathrow Airport by cutting through a fence and chaining themselves together on a runway today in protest against a possible third runway at UK's busiest airport.


Direct action group Plane Stupid said 13 demonstrators opposed to the airport's expansion plans with a third runway got on to the northern runway.


Six protesters have been arrested on suspicion of Aviation Act offences, Scotland Yard said. The runway was closed for nearly three hours and 13 flights were cancelled.


The airport apologised for the disruption caused and advised passengers to check with their airlines before they travel. Some protesters are still at one of the runways and the police said officers would remain at the scene until all the demonstrators had been removed. The airport's southern runway remained open throughout the protest.