A black-headed gull brought down a drone over a school in south-west Scotland. A roof survey was being carried out at Stranraer Academy in July when the attack occurred. An Air Accidents Investigation Branch report said the pilot had never experienced the level of aggression shown by the bird. It attacked the 6kg (13lb) drone, causing it to crash on the school roof and suffer substantial damage. The incident happened at about 12:20 on 8 July. The AAIB report said all normal pre-flight checks had been carried out, including an assessment of potential bird interference.