New Delhi, May 24 -- Eighteen people were injured in a knife attack in that took place in Hamburg station in Germany on Friday evening, Germany's Bild newspaper reported. Local police confirmed they 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 a 39-year-old woman, a German national, was arrested at the scene. She allowed herself to be arrested without resistance. Police believed after watching video footage that she acted alone. They secured the knife.

"So far we have no evidence that the woman could have acted with political motivation," said Hamburg police spokesperson Florian Abbenseth. "Rather, ...