Eighteen people were injured in a knife attack in Hamburg station on Friday evening, Germany's Bild newspaper reported, and local police confirmed they had arrested the suspected assailant.
Four victims are in critical condition and six others are seriously injured, Bild reported, saying the motive for the attack was unclear.
Police said the suspected assailant was a 39-year old woman who allowed herself to be arrested without resistance.
"So far we have no evidence that the woman could have acted with political motivation," said Hamburg police spokesperson Florian Abbenseth. "Rather, we have findings on the basis of which we are now investigating in particular whether she may have been in a state of mental distress."
German Chancellor Friedrich Merz said in a post on social media platform X that the news from Hamburg was "shocking."
"My thoughts are with the victims and their families," he said.

Former US VP Dick Cheney dies at 84
Dozens killed, army helicopter downed as Typhoon Kalmaegi hits Philippines
Trump threatens to cut funds for New York City if Mamdani wins mayoral race
Worker trapped under collapsed medieval tower in Rome dies
