Isabel Mercedes Celis, missing Ariz. girl, was abducted, police
confirm  This undated photo provided by the Tucson Police Dept.
shows Isabel Mercedes Celis. Tucson police are searching for a
6-year-old girl who went missing from her home on the city's
east side. Isabel Mercedes Celis was last seen late Friday and
discovered to be missing at about 8 a.m. Saturday, April 21,
2012. AP Photo/Tucson Police Dept.  Isabel Mercedes Celis Isabel
Mercedes Celis AP Photo/Tucson Police Dept.  (CBS/AP) PHOENIX -
Police investigating the disappearance of 6-year-old Arizona
girl Isabel Mercedes Celis confirmed Tuesday they believe she
was abducted.  Pictures: 6-year-old vanishes from Arizona home
Investigators have searched the girl's Tucson, Ariz., home,
interviewed more than 500 sex offenders and waded through
1,000-plus tips. So far, they haven't named a suspect.  Police
previously characterized the case as a "suspicious
disappearance/possible abduction."  Authorities have been
searching for the girl since her father re