Travellers at London and Europe's busiest airport seemed irritated as they had to footstep over climate change protesters lying on the floor yesterday afternoon (local time).
A small group of peaceful protesters staged a "die-in" at Heathrow's Terminal Two, with many wearing white masks to highlight the impact of air travel on carbon dioxide pollution levels.
Hundreds of like-minders dressed in red also took to the airport's surrounding streets staging a "bike block", which was reported by drivers to have caused "traffic carnage".
The demonstrations, organised by activist group Reclaim the Power, were an effort to avert the government's proposed decision to expand the airport and build a third runway.
Heathrow said the occasion did not affect any air travellers heading to their destinations.