Police say several people also injured while the suspected shooter has been arrested.

Two suspects were detained following the shooting on Monday, one of whom is believed to be the alleged attacker. The motive is not clear.

“Homicides involving multiple victims occurred at a youth welfare facility,” police said. “Five people were fatally injured and additional individuals sustained injuries.”

Police in Stade said a major operation was being conducted on Dankersstrasse, a street south of the city centre. People were urged to avoid the area and follow the instructions of the emergency services.

Stade is about 40km (25 miles) from Hamburg with a population of half a million.