NATO has ramped up defences in the Baltic Sea after mysterious drones continued to menace military bases and airports across Europe.

It comes just a day after suspected drones swooped over Denmark's largest military base - sparking security fears.

More drones were observed over Danish military sites overnight for the second straight day, Denmark's army said today.

"The Armed Forces can confirm that drones have been observed at several of the Armed Forces' locations during the night. Several capacities were deployed," the military said in a statement.

Denmark's military said unidentified drones had been observed over "several military sites" overnight Friday to Saturday, but refused to disclose any other details.

They were spotted flying over the Karup Air Base, which houses all

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