Protesters block tunnel at London's Heathrow airport

Activists opposed to the expansion of London's Heathrow Airport blocked an approach tunnel on Thursday by chaining themselves to a parked vehicle, sowing traffic chaos around Europe's busiest airport. The airport said police were dealing with a protest in a tunnel used by cars and taxis to access its terminals. "We can confirm there is a protest taking place in the inbound tunnel which is currently affecting traffic around the central terminal area," Heathrow said in a statement.