A wall of water hit people in two vehicles in Hildale, washing the automobiles and their 16 passengers downstream, Washington County Emergency Services said in a statement posted on Facebook.
Only three people in the vehicles made it out safely and among those dead and missing were children, including a four-year-old, Hildale assistant fire chief Kevin Barlow told The Salt Lake Tribune.
"They were well back from the flood, but this was a very significant surprise flash flood that caught them unawares," Barlow said, adding that the passengers seemed to be from various families.
The Utah Division of Emergency Management confirmed today that "an additional victim has been located below the Central Street crossing bringing the total number of confirmed fatalities to eight. There are still five unaccounted for."
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Crews searched for missing people in the flood waters but scaled back the operation at nightfall as conditions were still dangerous.
Flooding left streets clogged with mud, rocks and debris, Washington County Emergency Services said in a statement posted on Facebook.
The flooding reportedly began after heavy rain hit canyons just north of town.
"Everyone is family here, and it's a tragedy however you look at it," the resident, Ted Barlow said.
US Senator John McCain of Arizona said his thoughts were with those affected by the storm.
"My deepest condolences are with the victims and loved ones of those killed in flash flooding along the Arizona-Utah border last night," he said in a statement, thanking law enforcement and search-and-rescue crews for their quick action.
Scattered thunderstorms could appear in the Hildale area later today, according to weather.Com.