In the case of the two dead in Fischerhude, the 64-year-old suspect presented himself to the police on Wednesday morning.
The investigators announced.
The man is suspected of killing a 56-year-old man and a 73-year-old woman in a residential building in Fischerhude near Bremen and seriously injuring a 53-year-old woman on Tuesday evening.
Eyewitnesses reported multiple shots.
The investigation by the homicide squad into what happened and the background to the crime continued, according to the police.
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