Authorities say five restaurant workers were killed in a house fire near Detroit.

The Detroit News reports that the five people were found Sunday after crews extinguished the fire at a house in the suburb of Novi. Emergency personnel tried to revive two of the victims but weren't successful.

Officials say the victims appeared to be in their late 20s and early 30s and were co-workers at an area restaurant.

Novi Public Safety Director David Molloy says a preliminary investigation shows the fire started in the basement.

The fire was reported at around 9:30 a.m. The cause of the blaze is under investigation.