Several people were injured when a car rammed into pedestrians at a parking lot of Cologne Bonn Airport, local media reported on Friday.
The 57-year-old suspect was arrested and transported to a local hospital, a police spokesman told reporters at the scene, adding that he was believed to have mental problems.
Most of the injuries were minor, and not life-threatening, public broadcaster WDR reported.
Two police officers were also slightly injured as the suspect resisted arrest, according to the report.