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At least one other person is believed to have been hurt.

The incident has taken place on Kipdorf in Wuppertal-Elberfeld, in the city in North Rhine-Westphalia.

Special forces have been deployed and police have descended on the scene, forming a ring of steel around the area.

A special forces commander said systematic searches were taking place in neighbouring buildings.

Local media have reported the killer - or killers - have not yet been caught.

The dead man is believed to be 31-years-old and the other injured person, 25.

Early reports say the incident took place at a haridressers.