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Potsdam (AP) - In a Potsdam clinic, according to initial findings by the police, four people were killed.
A 51-year-old woman was arrested on urgent suspicion, said a police spokesman.
There is a suspicion of a homicide.
One person was also seriously injured.
The police had been on duty in the Oberlinklinik in Potsdam-Babelsberg since about shortly before 9 p.m.
The emergency pastoral care was also on site.
© dpa-infocom, dpa: 210428-99-393796 / 2