(TUCSON, Ariz.) -- Relatives of Isabel Mercedes Celis, a 6-year-old girl who went missing from her Tucson, Ariz., bedroom over the weekend, say they will "never give up" in their efforts to track her down.
"We appreciate everyone's interest in finding our daughter, Isabel, and thank all the volunteers who have come out to search for her," the family said in a statement read by the Tucson Police Department.
"We are cooperating fully with authorities and are focused only on her safe return," the statement said. "We appreciate all your energy and efforts and continue to need the community's help. Please call the TPD if you have any information. We love Isabel and will never give up finding her. Thank you for all your support."
Tucson police searched the homes of a number of residences on Monday close to where Celis disappeared, including one home on the same street as the girl's house.
The search entered day three on Monday with investigators combing a nearby landfill, canvassing the neighborhood interviewing residents, and examining evidence that FBI search dogs "hit" in the Celis family home.
Celis was reported missing by her father around 8 a.m. Saturday after Celis' mother left for work and her father went to wake her up. The child was not in her room, and a bedroom window was opened with the screen removed, Tucson Police Chief Roberto Villasenor said.
The little girl was last seen around 11 p.m. Friday, when she was put to bed, he said.
Copyright 2012 ABC News Radio