KEY LARGO, Fla. (CBS4/AP) — Two men were discovered dead inside a boat and may have died as a result of carbon monoxide poisoning, authorities in the Florida Keys said.

According to the Monroe County Sheriff’s Office, two Fort Lauderdale men were found dead Friday morning inside a boat on a trailer at the Pilot House Marina in Key Largo.

The sheriff’s office reports that a portable generator was found in the boat’s engine compartment.

According to the sheriff’s office, the men had no visible injuries but their skin was reddish-pink in color, a sign of carbon monoxide poisoning. Detectives said there was no sign of foul play.

Autopsies are pending.

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