Nine Just Stop Oil activists have been arrested at Heathrow Airport but operations are continuing as usual, police have said.
They were detained near the airport and taken into custody on suspicion of conspiring to interfere with a site of key national infrastructure under the Public Order Act.
The Metropolitan Police said: “These arrests have prevented significant disruption to the airport and the travelling public.”
The group said “the international uprising begins” and that a number of people had been arrested “in two locations on the perimeter road around Heathrow”.
Footage shared on the Just Stop Oil (JSO) account on X, formerly Twitter, appears to show people cycling near a high barbed wire-topped fence close to passenger planes before dismounting and being approached by officers.
Allow Twitter content?
JSO said the action followed protests at multiple airports across Europe.
It claimed German supporters of climate activist group Last Generation were behind delays seen at Cologne-Bonn Airport.
The German airport reported that “unauthorised people” gained access to its security area on Wednesday morning.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version.
You can receive Breaking News on a smartphone or tablet via the BBC News App. You can also follow @BBCBreaking on Twitter to get the latest alerts.