Heathrow protest by climate activists causes delays on M4

Campaigners chain themselves to a vehicle, blocking motorway tunnel leading to airport

Climate activists protesting against Heathrow's planned third runway caused lengthy delays on the M4 by blocking a tunnel leading to the airport for three hours.

Campaigners for Rising Up used three cars to close the tunnel leading from the motorway to Heathrow Terminals 1, 2 and 3 at about 8.25am on Tuesday. Three protesters chained themselves to one of the vehicles, which had a banner reading: "No new runways".