Arizona Girl, 6, Disappears from Bedroom
04/23/2012 AT 05:00 PM EDT
Little Isabel wasn't there. After a quick search of their home, Celis called 911.
In the last two days, more than 100 law enforcement officials, including FBI and U.S. Marshals, have scoured a Tucson, Ariz., neighborhood for the 44-pound girl with hazel eyes, light brown braids and a smile missing two baby teeth.
The search has included the family's home, where police have found "suspicious circumstances."
"We have a window that was opened and a screen removed. We're labeling it as suspicious circumstances and a possible abduction," police chief Roberto Villaseñor said Monday, according to CNN.
Two search warrants were served and Isabel's parents have not been allowed back into their home that they shared along with two sons, according to reports. The entire block has been cordoned off and only residents are allowed to drive through.
Police say Sergio and wife Becky are cooperating. The couple was questioned separately for hours on Saturday, according to the Arizona Republic.
No one has been named as a person of interest.
"We want to keep our mind open because we don't want to miss any leads that may come in or any clues that may be there and that we don't see them because we're focused so blindly on something else," Villaseñor says.