Tucson Police announced Monday that they are expanding the search for missing six-year-old Isabel Mercedes to a 3-mile radius around the Broadway and Craycroft area.
While police have questioned all 17 sex offenders in the area, they have named no suspects and are now searching area landfills.
Hundreds attended a vigil in Isabel's honor Sunday night, as the community comes together in hopes of bringing the first grader home safely.
With few clues, Tucson police say they are working against the clock.
On Sunday, Tucson Police Chief Roberto Villaseñor said there are no new clues in the search for missing six-year-old Isabel Mercedes Celis. The six-year-old Tucson girl went missing from her home near Broadway and Craycroft Friday night.
Isabel's parents last saw her in bed at 11 p.m. Friday, and they discovered her missing at about 8 a.m. Saturday, Tucson police spokeswoman Sgt. Maria Hawke said.
In a television interview, Hawke said multiple agencies have participated in the investigation. With 250 officers from the Tucson Police Department, Pima County Sheriff’s Department, the FBI and U.S. Marshals, officials still have not found Isabel.
Police focused on a 2.5-mile radius near the girl's home on Saturday.
Hawke said earlier that investigators were looking into all potential scenarios, including the possibility that Isabel got up and wandered out of the home she shares with her parents and two brothers.
Also involved are Department of Corrections bloodhounds, search and rescue experts and a Pima County rapid response team.
But late Saturday, when asked if police still think she might have wandered away, Hawke responded: "We are treating it as a suspicious disappearance and possible abduction."
Family members and neighbors told local television news stations that they are in complete shock, as the search continues.
Family members and friends also worked throughout the day to distribute fliers at the Park Mall, and other shopping centers.
Anyone with information on Isabel can contact 88-CRIME.
Isabel is described as just under 4-feet-tall and weighing 44 pounds, with brown hair and hazel eyes.