I wonder when we are going to be told this is a well planned protest by environmentalists! I am just wondering if the airport has been warned of the drones by the operators, and it closed by NOTAM, can it be a case of endangering aircraft? However the flight of a drone within the ATZ clearly is an offence if they can find the offender.
I would say the problems of drones at public gatherings, prisons and airports if police firearms units and transport police had shotguns within their armory. But the trouble with this, being what I believe a protest, will be multiple launches of drones.