Groups of unidentified drones prompted a busy German Airport to close briefly as authorities investigated.

Dozens of flights to and from Munich Airport were cancelled or delayed due to the mystery drones.

Thousands of passengers were affected by the closure, with local authorities adding that they still don’t know who or what was behind the drones. The airport has now reopened.

A spokesperson said: ‘Nineteen Lufthansa flights were affected, either cancelled or rerouted, because of the airport suspension.’

Last week, more suspicious drones were spotted over northern Germany on the very same night they were seen near a Swedish naval base.

Authorities in Schleswig-Holstein are investigating the prospect that the drones were up to espionage or sabotage, the interior minister said.

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