German police said they shot and wounded a man armed with a knife who attacked a right-wing demonstration in the southwestern city of Mannheim around noon on Friday.

Social media footage showed a bearded man attacking people in the city's central Marktplatz square with a knife. One person appears to be stabbed in the leg and a policeman who tries to intervene appears to be cut in the neck. Another policeman then shoots the attacker.

The identity or motives of the attacker were not immediately clear and police said they could not yet give details about any injuries among the demonstrators in the square.

They said in a statement that there was no longer any danger to the public.

 (With input from agencies)