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A man armed with a handgun foiled the suspected robbery of a Vernal Arby's.

Shortly before noon, a woman with a knife arrived at the Arby's at 1141 W. Highway 40 and allegedly demanded money, according to a Vernal Police Department news release. During the robbery, a man arrived at the Arby's, then went back to his vehicle, returned with a handgun and confronted the woman, according to the police.

Officers arrived and detained both of them, but "immediately determined" that the man had detained the woman, according to the news release.

"The Vernal Police would like to thank the concerned citizen for his immediate action," the news release reads. "The Vernal Police would also like to point out that personal safety is always the priority, and that citizens must recognize that any person holding a firearm upon their arrival is apparently involved until proven different."

The 37-year-old woman was booked into Uintah County Jail under suspicion of aggravated robbery and possession of a controlled substance, the news release adds.

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