Seven Just Stop Oil protesters have been arrested outside Heathrow Airport, the climate group has said.The protesters were arrested at two locations outside the UK’s busiest airport as climate protesters across Europe tried to block air traffic.Demonstrators at Cologne Bonn Airport glued themselves to the runway causing chaos for travellers.Just Stop Oil added that supporters of Folk Mot Fossilmakta (People against Fossil Power) cut through a chain-link fence and sat next to a runway stopping flights departing from Oslo Gardermoen airport.Extinction Rebellion supporters in Finland also reportedly blocked security gates at Helsinki Vantaa Airport on Wednesday morning.Meanwhile in Spain, five supporters of Futuro Vegetal accessed the taxiway at Barcelona airport, but were intercepted before taking action.