Isabel Mercedes Celis

Courtesy: Tucson Police Department

Tucson police search an area landfill for 6-year-old Isabel Mercedes Celis

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Tucson police search an area landfill for 6-year-old Isabel Mercedes Celis

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Memorial for missing 6-year-old Isabel Mercedes Celis

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Isabel Mercedes Celis was discovered missing at 8 a.m. Saturday from her Tucson home.

Corey Rangel

Tucson police are searching for 6-year-old Isabel Mercedes Celis.

Corey Rangel

Isabel Mercedes Celis went missing from her Tucson home over the weekend.

Corey Rangel

Volunteers have been posting fliers of the girl -- who is described as about 4-feet-tall with brown hair and hazel eyes -- in gas stations, malls and fast food restaurants.

Corey Rangel

KNXV