Airport traffic was suspended at Hanover airport on Saturday after a car crashed through a barrier onto the runway, police said.
"A security incident occurred at Hanover airport around 15h40 (14H40 GMT). A man broke through a barrier in a car which went onto the runway," Hanover police said on Twitter.
The man, whose car was registered in Poland, was quickly arrested and is being questioned.
Check-in for some flights remained suspended as of 1830 GMT while police investigated.
Part of terminal A was closed but the two other terminals were open, police told German news agency DPA.
Incoming flights were being diverted to other airports.
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