Two pilots reported a suspicious incident involving what appeared to be drones shortly after 9:00 am, a police spokesman said.
"In coordination with German air traffic control, the security authorities then decided to close the runways," the spokesman said.
A police helicopter was deployed and security personnel were "clarifying the situation", he added.
Flights were able to resume at 10:05 am, according to an airport spokesman.
An "extensive search by emergency services found no threat" to public safety, the spokesman said.
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