A light flashes in the night sky over London's Heathrow Airport late Tuesday after a drone sighting grounded all departures. <br /><br />The incident falls less than a month after Gatwick Airport was forced to close after reported drone sightings, impacting around 1,000 flights. <br /><br />Filmer Sebastian Haque, who lives near the northern runway, speculated that the light could be the drone, saying it was "what appears to be a drone hovering over London Heathrow." <br /><br />However, further footage from the scene suggested the light may have been a police helicopter.
