St. George police Public Information Officer Johnny Heppler said police were called to the US Bank, 792 Bluff Street, around 1:00PM by a woman who said she was robbed while at the bank's ATM.
The woman said she was at a drive-through ATM when a man approached her, brandished a knife and demanded money.
"She gave him an undisclosed amount of cash and he ran away," Heppler said.
No one was injured before the man fled, running to a nearby red Toyota passenger car and driving away. The suspect was followed by the victim and other witnesses, who passed information on to police dispatchers, Heppler said.
Officers in the area located the man and were able to detain him. Heppler said they recovered a knife and cash.
Sarkis George Abechian, 41, of Burbank, California, was booked into the Washington County Jail for investigation of aggravated robbery. Bail was set at $20,000.