Special forces have been deployed to the scene but the alleged attacker is still on the loose.
The police said they were hunting for one or more assailants, but could not immediately provide more information about the circumstances of the attack.
The attack took place at a hair salon, according to the Westdeutsche Zeitung.
It is thought that the man who was killed was aged 31 and the injured person is 25-years-old.
The police are still seeking for unknown number of suspects.
Reports also claim that the special forces are searching nearby buildings.