Five restaurant workers were killed in a house fire in suburban Detroit Sunday, NBC News reported.

The fire started in the basement of a home in Novi, Michigan, authorities said.

The victims, who haven’t been identified, worked together at a local restaurant. They were found only after crews put out the fire, according to The Associated Press.

The cause of the fire is not known and is under investigation, according to NBC affiliate WDIV.  

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Article source: http://www.nbcchicago.com/news/national-international/Five-Detroit-Area-Restaurant-Workers-Killed-House-Fire-367151991.html