Germany's Munich airport evacuated its control tower and temporarily suspended flights due to the smell of smoke.
The airport said the tower - from which air traffic controllers co-ordinate aircraft - was evacuated at 8.33pm local time on Sunday.
Flights were paused but the airport later said operations had resumed at 10.15pm after the fire department gave the all clear.
However, it warned passengers to expect delays and disruptions and to contact their airline for an update.
Its arrivals board showed multiple inbound and outbound flights had been delayed and others diverted.
Local media said the incident appeared to have been a false alarm.
Munich airport is the second-busiest in Germany, after Frankfurt, and one of the busiest in Europe.
Flights were also halted for a short time on 30 May after two pilots in separate planes on the tarmac reported a drone over the airport.
A police helicopter search found nothing and operations restarted about an hour later later.
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