ITV: A group of climate change activists have gained access to the north runway at London's Heathrow Airport to launch a protest.
A spokesman for direct action group Plane Stupid said a dozen demonstrators cut through a fence and entered the runway at 3.30am.
He said the protesters were campaigning against airport expansion and would stay on the runway for as long as possible.
Posts on social media showed several activists chained together and being spoken to by police officers.
A spokesperson...