"There is no valid information yet on the motive or the number of people injured" by the man, who "entered a supermarket and suddenly began attacking customers", said police, adding that one victim died from their severe wounds.
German daily Bild published a picture of the attacker in the back of a police car with a white, blood-soaked bag over his head, and reported that he cried "Allahu Akbar" (God is Greatest) in the supermarket.
"It was definitely a sole attacker. The first reports about a possible motive of a robbery have not been confirmed," Hamburg police tweeted.
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