(CNN) Two of three children who went missing after floodwater swept up their vehicle in central Arizona have been found dead, the Gila County Sheriff's Office said Saturday.

The search continues for the third child, authorities said.

The children vanished Friday when a car crossing Tonto Creek, about 60 miles west of the New Mexico border, was caught in flooding around 4 p.m. local time, Gila County Undersheriff Mike Johnson said.

Four children and an adult escaped the car onto an island in the creek, authorities said.

Four children and one adult managed to get out of the vehicle and were stranded on an island in the creek, where they were rescued by a helicopter from the Maricopa County Sheriff's Office, Johnson said.

A woman who was in the water also got out, but three children were unaccounted for, the undersheriff said.

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