Carrying placards reading "You Fly, They Die" and "Carbon Kills," hundreds of people protested Sunday against the planned expansion of London's Heathrow airport.
The Camp for Climate Action organized the march to end a week-long campaign aimed at drawing attention to how aviation is affecting the environment.
Police in riot gear and truncheons clashed with protesters Sunday as they approached the headquarters of BAA, the Heathrow authority.
Small groups of protesters also headed toward the village of Sipson, where part of a new runway for the world's busiest international airport is to built, police said.
A fifth terminal is scheduled to open at the airport in March, 2008, and the government has proposed the third runway to open around 2020.
There have been traffic jams caused by police checks on a major highway leading to the airport, but Heathrow officials said air travel was not disrupted.
With files from the Associated Press
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