About a dozen protesters from the group Plane Stupid entered the runway at 3:30 a.m. (0230 GMT Monday; 10:30 p.m. EDT Sunday) to challenge plans to expand Europe's largest airport. All had been removed, the airport said in a statement.
An independent commission concluded earlier this month that building a third runway at Heathrow would be the best way to give Britain the additional aviation capacity it says is urgently needed. Environmental activists are outraged by the results of the three-year study, saying that a new runway will make air quality worse and exacerbate climate change.
Heathrow is urging people travelling to check with the airlines before departure, even though the protest is over. Both runways remained open.
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