German authorities in the north-east region of Brandenburg are investigating reports of an alleged video recording of a Syrian refugee who claimed to have fought for the Islamic State. The refugee, who lives in an asylum-seeker shelter, reportedly told fellow refugees that he had killed for Isis.

According to German newspaper Welt am Sonntag, the Federal Criminal Police is investigating the potential terrorist on behalf of the Federal Prosecutor's Office. The alleged terror suspect has been classified as a "dangerous person," the newspaper reported.

The man was filmed by other refugees in the shelter making his claims of Isis-ties, thus leading to the probe by police.

The Daily Mail reported that the German authorities have stressed that at the moment they only have the words of the other refugees and are looking into the allegations. Authorities added that despite the case, they do not believe terrorists have infiltrated the incoming stream of refugees from Syria and other war-torn nations.

German officials have investigated several allegations of radical Islamists entering Germany posing as refugees, Welt am Sonntag reported.

Photographs of alleged Isis militants from Syria and Iraq who are now seeking asylum in Germany have been investigated. However, Welt am Sonntag reported that the images, which were shared mainly on social media, have turned out to be deliberate falsifications or confusions.