Plane Stupid said on its website that the action was intended to draw attention to CO2 emissions from the aviation industry.

BBC: Stansted protest cancels flights

Nine members of Plane Stupid, which campaigns against airport expansion and aviation-related climate change, entered the airport grounds at about 2:15 a.m.

CNN: Climate protesters blame Donald Trump for airport expansion

Leo Murray is a spokesman for climate change campaign group Plane Stupid.

BBC: Is it a crime to take pictures?

Last year, activists from Plane Stupid occupied the roof for three hours in protest against Heathrow expansion, resulting in five activists being found guilty of trespass.

BBC: Parliament rooftop protest ends