German Interior Minister Alexander Dobrindt said Friday that the temporary closure of Munich airport after drone sightings was a "wake-up call" about the threat from drones, which have caused a string of similar aviation disruptions across Europe.

Airports in Denmark, Norway and Poland have recently suspended flights due to unidentified drones, while Romania and Estonia have pointed the finger at Russia, which has brushed off the allegations.

Munich became the latest to close its airspace on Thursday night after several drone sightings, causing more than 30 flights to be cancelled or diverted and leaving nearly 3,000 passengers stranded.

Dobrindt told the Bild newspaper that the incident was "another wake-up call".

"The race between the threat from drones and the defence against drones

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