Denmark's prime minister has said she "cannot deny" that drones seen over Copenhagen Airport were flown by Russia. Danish police said the drones came from different directions and their lights were turning on and off. Authorities in Norway shut the airspace at Oslo airport for three hours after a drone was seen there, too. Danish Prime Minister Mette Frederiksen said the incursion was the "most serious attack on Danish critical infrastructure to date". He described the drone pilot as a "capable actor" and said they seemed keen to show off their skills while practising different techniques, perhaps.