Both runways at Germany's Munich airport have closed for the second time in less than 24 hours after drones were again sighted, leading to dozens of flights being diverted or cancelled and stranding some 6500 passengers.

Early on Saturday morning, the airport said its scheduled 5am opening had been delayed due to drone sightings, advising passengers to contact their airlines.

"German air traffic control restricted flight operations at Munich Airport as a precautionary measure due to unconfirmed drone sightings and suspended them until further notice," a statement on the airport website read.

In a later update, the airport said 23 flights were diverted, 12 flights to Munich and 48 departures cancelled or postponed.

"As on the previous night, the airport and airlines took care of the pas

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