Dubai International Airport was forced to ground flights for half an hour due to a drone flying in the area. The airport said airspace around the airport closed today because of unauthorised drone activity. <br/><br/> It is not the first time drones have delayed flights at the airport, one of the world's busiest. On June 12 a similar incident saw Dubai International Airport close for 69 minutes.<br/><br/>In the wake of the incident, authorities in the United Arab Emirates have announced plans to tighten the rules on buying and using drones. Drone owners must already register with the UAE General Civil Aviation Authority.