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GREENBRIER, Tenn. (Jan. 26, 2016) – A Tennessee teenager who died last week may have consumed a mixture of racing fuel and Mountain Dew, police say.

Logan Stephenson, 16, died on Thursday. According to Greenbrier Police Chief K.D. Smith, Stephenson and a friend started drinking the concoction Wednesday. Stephenson was found unresponsive the next morning, reports WZTV.

“They noticed the color of his skin had changed and he started having a seizure. His hands started drawing up,” Smith told WZTV.

Stephenson’s friend was rushed to an area hospital. Police said he was in a coma.

Since the incident came to light, two other teens have admitted to drinking the same mixture of racing fuel and Mountain Dew. Police encouraged parents to talk to their children.

“Ask your children,” Smith said. “Get them to be open and honest with you. Nobody is going to be in any trouble.”

Police are awaiting the results of a report from a medical examiner to learn Stephenson’s exact cause of death.