At least twelve people were injured, including six critically, in a knife attack at Hamburg's central train station, emergency services reported Friday.
Three people suffered severe injuries, while three more were slightly injured.
Police said a person was detained at the station after stabbing people at random on platform 13/14.
A spokesman for federal police said the detainee was a 39-year-old woman, with investigations under way to determine a motive.
A major police operation was under way at Hamburg's central train station, one of the busiest public transport hubs in Germany.
In a statement, the national railway operator Deutsche Bahn expressed its "deep dismay" at the attack.
"Our thoughts and sympathy are with the injured," the company said, warning of disruption to journeys.
A ban on carrying knives has been in place at the station since October 2023, with another ban on knives on public transport having taken effect in December 2024.
Germany saw a number of attacks in public places in the run-up to parliamentary elections in February.
