The drone that flew over Sofia Airport is of a military type and is used for espionage and surveillance

The mysterious drone that made random maneuvers at Sofia Airport on February 7 and delayed six flights was hacked, manipulated, and was definitely not random. Large drones like the one used are military-type and are used for espionage and surveillance, Border Police Director Anton Zlatanov told public broadcaster BNT.

''A drone sold by a licensed company will not be able to fly over the airport because the area is restricted. This indicates that the drone was manipulated and that this was a deliberate action'', Anton Zlatanov said further.

The drone was apparently hacked, said Todor Ivandjikov, President of the Bulgarian Aviation Industry Association. ''In most drones, the software is programmed to include the airport as a restricted zone. This drone was apparently hacked or specially assembled, with its software allowing it to pass anywhere'', the expert commented.