Russia denounced any accusation that it might be involved.
“We hear unfounded accusations from them every time,” said Kremlin spokesperson Dmitry Peskov, according to the Interfax news agency. “Perhaps a party that takes a serious, responsible stance should not make such unfounded accusations again and again.”
At a press conference, Flemming Drejer, director of operations at Denmark’s PET intelligence service, said that national authorities are looking in all directions for a cause.
“But it is clear that, given the current threat and what we are seeing on the international scene, this is something we are aware of,” Drejer said in response to a question about Russia.
Russia sent drones over Poland earlier this month, several of which were shot down, as well as over Romania. Three Russian fighter jets were intercepted in Estonian airspace on Friday.
Anne Tønnes, director of the Copenhagen police, said it is something “extremely serious when you close an international airport for four hours.”