The two Canadian teenagers were apprehended by US Border Patrol agents after they inadvertently -- and illegally -- crossed the US-Canada border while playing the game on their phones, officials said.
The agents encountered the teens walking southbound from the Canadian province of Alberta, into Montana, while playing Pokemon Go, the Department of Homeland Security's US Customs and Border Protection agency said in a statement.
Border Patrol agents quickly determined that the teens were unaware they had crossed the border, the statement said.
"They crossed the international border inadvertently, but agents were able to reunite them with their mother," he said.
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Their mother, who was nearby on the Canadian side, was contacted by agents while the teens were being detained.
The teens were apprehended near Sweet Grass, Montana, which borders the town of Coutts, Alberta.
The incident comes amid a surge in incidents of people getting into trouble while playing Pokemon Go.
In Quebec City, police said two officers suffered minor injuries when a car they observed driving strangely reversed into their cruiser in a parking lot.
"The driver said 'I'm sorry, I was playing Pokemon Go'," said Const. Nancy Roussel.
In a bizarre incident in the US, a woman last week got stuck up in a tree inside a cemetery while playing Pokemon Go.