“According to initial information, a person injured several people with a knife at the main train station,” Hamburg police said in a post on X. “The suspect was apprehended by the responding forces.”

A spokesman for the Hamburg fire department told AFP that 12 people had been injured in the attack.

Among them were “six people with life-threatening injuries”, the spokesman said.

Some of the victims were being treated in trains, according to the German daily Bild.

Germany has been rocked by a series of violent attacks in recent months.

On Sunday, four people were injured in a stabbing at a bar in the city of Bielefeld.

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The investigation into the attack had been handed over to federal prosecutors after the suspect in the attack told the police officers who arrested him that he had extremist beliefs.