Police in Michigan have launched an investigation into what caused the three deaths and two hospitalizations at the Faster Horses Festival over the weekend.

On Saturday, the Lenawee County Sheriff’s Department released a statement addressing the incident in which festival-goers may have been exposed to carbon monoxide.

According to the statement, five males were found unresponsive after a worried friend contacted authorities. “The caller was a friend of the five males and became concerned when he had not heard from them,” the statement read.

“The tragic incident is being investigated as a suspected carbon monoxide exposure from a generator located very near the travel trailer.”

When deputies and a medical emergency team arrived at the campgrounds in Woodstock Township, they found five males in their early 20s inside of a travel trailer.

First responders declared three dead on the scene and transported two of the men to a local hospital in critical condition to be treated for acute carbon monoxide poisoning.

Investigators suspect a carbon monoxide leak from a nearby generator may have caused the injuries and deaths.

“First responders stress the importance of keeping generators away from camping areas, tents, travel trailers, etc. as well as exhaust fumes from running vehicles,” police said in the statement.

Faster Horses is a three-day country music festival that takes place in Brooklyn, Michigan. The festival began on Friday and is expected to end on Sunday.

Event organizers have yet to publicly comment on the deaths and hospitalizations of the festival attendees.

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