The man was a Slovakian whose fingerprints were held on a police database as he had a criminal record. “We know he was a Slovak citizen but we are still looking into his background,” police spokesman Paul Eidenberger told Radio Wien.
The identities of the other four victims are still not known. They were between 17 and 35 years old, and one was a woman.
It's also not clear what caused the fire in the former bar and restaurant, although police have said that there was no evidence of foul play. An old solid fuel burner was found in the ruins of building.
Police had previously speculated that the bodies might be those of homeless people who had been sheltering in the building.