Immunity offer expires for missing girl's mom

ORLANDO, FL The state attorney's office said it had not heard back from Casey Anthony before the offer expired Tuesday morning.

Anthony's attorney didn't immediately respond to a phone and e-mail message for comment.

Investigators have been searching for 3-year-old Caylee Anthony since mid-July when she was reported missing after not being seen for about a month.

Prosecutors had extended an offer of limited immunity to the mother in exchange for cooperation.

Investigators have called Casey Anthony a person of interest in Caylee's disappearance. She faces charges of child neglect, obstruction and making false statements in the case.

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