The supermarket opened for business as usual with customers walking in and out.

One of the people that walked into the mall was a man with a knife.

Before people realised his mission, he had fatally stabbed one person and wounded four others as he fled, police has said. 

He was overwhelmed by passers-by and slightly injured in the process, police added. Officers then arrested the man.

Police say they don't yet have any information on the assailant's motive, but there is no indication that there were any further attackers.

Barmbek is in northeastern Hamburg, away from the downtown district.

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