Heathrow protesters cause chaos by blocking entrance to Terminals 1, 2 and 3

Police deal with rush-hour airport incident by campaign group Plane Stupid in which activist has locked himself to vehicle

Environmental activists have caused rush-hour chaos at Heathrow by parking a van across the entrance tunnel to Terminals 1, 2 and 3 and locking themselves to the vehicle so it cannot be moved.

The campaign group Plane Stupid says three of its members parked the van across the tunnel at 7.40am and unfurled a banner quoting David Cameron's election promise: "No ifs, no buts: no third runway".