Two Canadian teenagers accidentally crossed the U.S. border while playing Pokemon Go, U.S. officials have said. The teenagers were detained by U.S. Border Patrol agents late Thursday on U.S. soil, having wandered into Montana from Canada’s Alberta province. “Both juveniles were so captivated by their Pokemon Go games that they lost track of where they were,” the U.S. Customs and Border Protection agency said in a statement. Authorities were able to contact the teenagers’ mother, who was located on Canadian territory, and send them back to her. Pokemon Go, an augmented reality game which uses GPS to send users on scavenger hunts in search of virtual creatures, has taken the world by storm in recent weeks. But it has also sent players into no-trespassing zones and some dangerous areas.