Years ago we had a problem with birds foraging between the runways on an Air Force Base where I was stationed. We tried a lot of methods to frighten them off. We then paid a consultant who was an ornithologist for advice. His advice was simple—shoot about twenty of the birds and leave the carcasses in plain view. We did that and the rest of the birds moved out of the area. I would suggest the Macedonian police use life round and forget about the tear gas to deal with the invasion of these almost human maggots.
Them Macedonians are who brought the world, Alexander the Great.
They can be bad asses and not trifled with.