[Updated 11:25 a.m.] The house from which a 6-year-old Tucson, Arizona, girl went missing Saturday morning was being treated as a crime scene Monday as police said they were checking and re-checking more than 100 leads in the case.
Isabel Mercedes Celis was last seen by family members when she went to bed at 11 p.m. Friday. She was discovered missing when her father went to wake her at 8 a.m. Saturday.
Tucson chief of police Roberto Villasenor said Monday morning that investigators were looking over again many of the leads that have come in.
"You want new eyes looking things over several times," he told reporters in Tucson.
The chief said earlier police were investigating a broken screen in the childâ€™s bedroom as a possible point of entry into the house.
â€śWe have a window that was opened and a screen removed. Weâ€™re labeling it as suspicious circumstances and a possible abduction,â€ťÂ he said Monday morning on CNN.
He said police were hoping to find the girl but acknowledged that the longer she is missing, the more worried authorities become.
"This has been a race against the clock from minute one," he said. "Every hour that goes by is troublesome for us."
Police had not identified any suspects in her disappearance, and the family was cooperating in the investigation, he said.
â€śWeâ€™re still trying to determine where Isabel is. Thatâ€™s the primary concern and focus, to try and find her and bring her home safely,â€ť he said.
Villasenor said police had done a door-to-door search within a 2.5-mile radius of the girlâ€™s home.
â€śWeâ€™ve searched it at least three times now because of the size of Isabel and the fact that the area has open spaces as well as businesses and residences. Itâ€™s very elaborate to search all that area,â€ť he said.
Police had also contacted all registered sex offenders within a three-mile radius, Villasenor said.
But he said there is no single focus to the investigation.
â€śWe want to keep our mind open because we donâ€™t want to miss any leads that may come in or any clues that may be there and that we donâ€™t see them because weâ€™re focused so blindly on something else,â€ť the chief said.
FBI search dogs trained to help in missing persons cases are helping in the search, the chief said Monday morning.