Three "Pokemon Go'' players got locked inside a cemetery in northeastern Pennsylvania while hunting virtual monsters and needed police to let them out.

Police in Dunmore tell The Times-Tribune of Scranton the trio didn't realize the cemetery closed at dusk. They called police just after 9:30 p.m. Tuesday when they discovered the cemetery's gates were locked.

The wildly popular smartphone game has caused concern from law enforcement around the country. Many departments are urging players to pay attention to their surroundings following reports of robberies and accidents involving players distracted by the game, which sends players to various locations in the real world to collect virtual creatures.

Dunmore Police Chief Sal Marchese says the three won't be charged and no details about the gamers were revealed, other than at least one was an adult.