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AP Photo TP101 ORANGE PARK, Fla. (AP) Investigators have no clues three days after the disappearance of a 7-year-old girl in North Florida.

The mother of Somer Thompson went on all three network national morning news shows Tuesday with a tearful appeal for the child's return. She said she assumed someone has her daughter.

Sheriff Rick Beseler appeared with mother Dina Thompson and said investigators are baffled. He told the CBS "Early Show" that officers have interviewed about 75 known sex offenders in a five-square-mile area.

Somer vanished on her way home from school Monday in Orange Park, near Jacksonville. Investigators have said they suspect foul play. The sheriff said someone must know where she is and urged the public to call in tips.

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