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Climate change campaigners who have been camped at Heathrow Airport for the past week have begun their 24 hours of direct action.
Protesters began a march at midday to mark out the 3km (1.8 mile) route of the airport's proposed third runway.
There were a few minor scuffles as police officers encircled the group during their procession.
Up to 2,000 people are expected to take part in the action, including a protest at airport operator BAA's headquarters.