A Pokémon Go player has made a grisly discovery while visiting a local river in search of digital critters.

Wyoming resident Shayla Wiggins,19, spotted a body floating in the Big Wind River while searching for aquatic Pokémon under a bridge yesterday, local news blog County 10 reported .

"I was walking towards the bridge along the shore when I saw something in the water," Ms Wiggins said.

"I had to take a second look and I realised it was a body.”

Ms Wiggins, who said the body was that of a man, immediately called emergency services.

An investigation was launched and the body was removed from the water by authorities, broadcaster KCWY News 13 reported .

The Fremont County Sheriff’s Office has since advised the man’s death appears to be accidental, and possibly the result of a drowning.

“Evidence located at the scene has led investigators to believe the man went into the water at the location he was found,” the police statement read.

An autopsy will be conducted to determine the dead man’s identity.

Pokémon Go is an augmented reality game that launched earlier this week and allows users to capture Pokémon in the real world by using their smartphone cameras.

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