SCOTTS MILLS, Ore. -- Authorities called off the ground search for missing Utah mother Susan Cox Powell early Thursday morning.

Police on Tuesday and Wednesday searched a rural property near Salem, Ore. for the body of the missing mother, who disappeared from her home in Utah in 2009.

Timeline: Susan Powell's disappearance

A tip from her father, Chuck Cox, led investigators to search for her remains on the rural property in Scotts Mills, said West Valley, Utah, Police Deputy Chief Mike Powell. The search was called off Thursday morning.

As of today we have reviewed all of our searches for the last two days and we have made a determination that we have covered the areas that we felt were important and necessary, Mike Powell said. We have no significant discoveries as a result of the ground search that has been taking place the last two days.

This has been a very long three-and-a-half years. A very difficult time, a very difficult investigation. It s a very suspicious disappearance, he added. And we still want to find Susan.

Susan Cox Powell disappeared from her West Valley City home in December of 2009. Her husband, Josh Powell, considered a person of interest in her disappearance, killed himself and the couple s two children in an explosion and house fire in Graham, Wash. in February 2012.

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Mike Powell said investigators have no reason to believe that the current or previous residents of the Scotts Mills property had anything to do with the disappearance.

Josh Powell's father, Steven Powell, is set to be released this month from the Monroe Correctional Complex, where he is serving time for taking voyeuristic photographs of two young neighbor girls in various stages of undress.

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