A couple in America are being accused of leaving their two-year-old son alone at home to play Pokemon Go.

Brent Daley, 27, and 25-year-old Brianna Daley were arrested after a neighbour found the boy crying outside the couple's home in a suburb of Phoenix, Arizona.

The local sheriff's office said the case was "beyond comprehension".

The child was left for 90 minutes and authorities say he was found barefoot, wearing a nappy and T-shirt.

The couple told police that they had gone out to buy petrol but then started looking for Pokemon monsters in their neighbourhood instead.

The Daleys are being accused of child neglect and child endangerment.

Their son has been turned over to the state's child protection agency.

Pinal County Sheriff Paul Babeu said his and other law enforcement agencies have warned people about personal safety while playing the smartphone game.

"But we never would have imagined that parents would abandon a child to play Pokemon Go," he said.

"This goes beyond comprehension."

It's not known if the Daleys have appointed lawyers able to comment on the allegations.

There's no phone listing for their names and they haven't responded to Facebook messages.

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