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Gotta catch 'em all, eh?

Two Canadian kids inadvertently crossed into the U.S. Thursday night while playing Pokémon GO on their cellphones, according to U.S. Customs and Border Protection.

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The pair was spotted and apprehended by border patrol agents, who "quickly determined in the field that the juveniles were unaware of their surroundings," a Border Patrol statement said.

Related: As Pokémon Go Consumes Country, Police Nationwide Issue Safety Tips

They were detained near Sweet Grass, Montana, which borders the town of Coutts in Canada's Alberta province, The Associated Press reported.

The Canadian siblings were reunited with their mother at a Border Patrol station, the statement said.

"Both juveniles were so captivated by their Pokémon GO games that they lost track of where they were," said Border Patrol Public Affairs Officer Michael Rappold.

The hit game, in which users venture out to real-world locations to try and capture monsters and battle over gyms, has prompted authorities to issue warnings about becoming too distracted.

The Washington State Patrol said it recorded its first Pokemon-related accident Monday when a 28-year-old driver distracted by the app rear-ended a sedan on State Route 202. No one was hurt.

In Baltimore early Monday, a driver playing the game struck a parked police car, police said. The officers were not in the vehicle and there were no injuries.