After the violent death of a pregnant woman and her unborn baby in Lüneburg, an arrest warrant was issued against the 37-year-old partner.
The man is suspected of having stabbed his wife, the police said on Saturday.
The officials said they had arrested the man from Tunisia on Friday due to traces at the scene and the circumstances of the crime.
Lüneburg - The suspicion was then confirmed, so that a judge at the Soltau district court issued an arrest warrant on Saturday at the request of the Lüneburg public prosecutor's office.
The police did not provide any further details about the background to the crime.
According to the first information, the investigators assumed a relationship crime.
After the crime, investigators secured traces and interviewed people around the victim.
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The pregnant woman was stabbed to death on Friday in an apartment building in Lüneburg.
According to the police, the partner stated that he himself discovered the 36-year-old lifeless in the apartment on Friday.
He then notified the neighbors, who immediately alerted the police.
The woman, also from Tunisia, suffered the stab wounds according to the investigation in the morning hours in the apartment, where she died.
The officers in the apartment secured the possible instrument, a knife.
dpa