Associated Press: Demonstrators climbed onto the roof of Britain’s Houses of Parliament on Wednesday and unfurled a banner protesting plans to build a third runway at London’s Heathrow Airport. Protesters from the group Plane Stupid reached the roof despite tight security at Parliament, including armed police guards. Protesters threw paper airplanes from the roof, and the banner – which was later cut down – said “No Third Runway.” Police said five people later were led down from the …