Denmark banned the use of civilian drones for five days next week as it steps up security ahead of a European Union summit in Copenhagen. The move is intended to eliminate the risk of confusing civilian-operated aircraft with hostile drones during the congregation of EU government leaders, the transport ministry said in a statement on Sunday. Military authorities reported new sightings near several defence facilities overnight, marking the seventh day of such incidents. Also read: Copenhagen, Oslo airports reopen after drones forced closureLast week, sightings of large, professional-grade drones forced the temporary closure of several airports in Denmark, including Copenhagen’s commercial hub, sparking a large-scale police investigation. The North Atlantic Treaty Organization, of which Denmark is a founding member, is deploying an air defence vessel to help counter the drones, according to TV2.