Police are investigating three separate cases of heavy stones being dropped on cars passing under a motorway bridge a few kilometres outside of Esbjerg on Thursday evening.
Police said that three different drivers reported their cars had been hit.
“It is reprehensible and disturbing that there is someone who can do this kind of thing,” Mads Leervad Dammark from Southern Jutland Police told DR Nyheder.
The first report came just before midnight on Friday morning – the other two closely after.
Police found the stones used in the attacks. All three are roughly 25 centimetres in diameter. Beyond that, they have few clues.
“We know little about who could have done this,” Dammark said. “We need to start by finding out if there is video surveillance in place that we can use in the investigation.”
A German woman was killed when someone dropped a concrete slab onto her family’s car from a motorway bridge on August 21.
The woman died when the 30-kilo stone struck where she sat with her husband and five-year-old son. The boy escaped serious injury, while the man was badly hurt.
Since that attack, several more stones have been dropped on vehicles passing under bridges across Denmark.