COLLBRAN, Colo. -

The search for three ranchers missing after a huge mudslide hit in a remote part of western Colorado has been called off.

Mesa County Sheriff Stan Hilkey said Tuesday the slide remained too unstable to continue searching for the men.
    
The three were checking on problems with an irrigation ditch caused by an initial slide Sunday when a second, much larger slide hit.
    
Authorities say the slide is a half-mile long and about 3 miles long. Hilkey says another slide is still possible.