Investigators say they have no new clues in the disappearance of a 6-year-old Tucson girl, but they continue to pursue more than 300 leads.

Tucson police chief Roberto Villaseñor says they're considering all possibilities, and that the girl's parents have been cooperating completely.

A $30,000 reward is now being offered in the case.   

In addition to Tucson Police,the FBI has sent agents and an evidence-recovery team to help in the search. A specially trained FBI search dog arrived in Tucson Sunday from Quantico, Va., to help in the search.

Isabel was last seen Friday night as her parents put her to bed. Her father discovered her missing at about 8 a.m. Saturday.

Villaseñor called the case suspicious and a possible abduction.

Celis weighs 44lbs and is 3-foot-8 inches tall, with brown hair and hazel eyes. She is missing one bottom and top tooth.

Police are asking anyone with information to call 911.

Family members have set up a facebook page, where they continue to post information about Isabel's disappearance.