A drone shut England's second largest airport for 30 hours this week. Police think "eco-warriors" used the drone to raise awareness of environmental problems. The drone stopped airplanes leaving the UK's airport over two days. It had to close its runway. Over 120,000 travellers were affected. They had to sleep on the airport floor or go to other airports. Some passengers spent nine hours sitting on a plane near the boarding gate.
The police want to stop other people using drones to cause danger. They are worried drones could attack airports and other important buildings. Police tried many times to stop the drone. They said: "When we look to reopen the airfield, the drone reappears again." The police and the British Army couldn't find the drone's operator. They are worried a drone could make a plane crash. The user of the drone could get five years in jail.