PS before somebody tell us what bird those can be, i can tell you something that i know. There is a gypsi camp right 200 metres before the threshold slightly right of the centerline. Full of garbage, smoking all the time to get materials out of old appliances and full of Gulls circling around it since few months now...that could be the case...even if i never seen so many gulls flying together here in CIA...always 2 o 3 max...so could not be the case this time, but nonetheless important to point out and maybe solve.
D