COLLBRAN, Colo. (AP) – Gov. John Hickenlooper has toured the mudslide area near Collbran where three men are still missing.

(credit: CBS)

(credit: CBS)

The governor flew over the half-mile-wide by 3-mile-long slide in a Colorado National Guard helicopter Saturday. The slide, which was triggered Sunday, is about 11 miles south of Collbran.

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Authorities are studying the site on a northern face of Colorado’s Grand Mesa to understand what triggered the event.

A memorial service is planned in Collbran on Sunday afternoon for the three missing men – 51-year-old Clarence “Clancy” Allen Nichols, his 24-year-old son, Daniel Allen Nichols, and 46-year-old Wesley “Wes” Melvin Hawkins.

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