According to a report by broadcaster NDR, one incident saw the police officer choke a refugee from Afghanistan and drag him through the cells with his feet in chains.
In another case he humiliated a refugee from Morocco by force feeding him rotten pork, reports Focus.
The policeman is then alleged to have reported on his abuses to a friend through WhatsApp with messages such as “I beat him down”, “I stuck my finger in his nose” or “I choked him, that was funny”.
He is also alleged to have sent picture of the abuse in which a man can be seen bound in an unnatural position with a clearly pained expression on his face.
According to NDR, investigators searched the man's house as well as the police station on Friday.
Private refugee guards investigated