WINTER HAVEN, Florida -- Two girls were arrested in a Florida bullying case after one of them admitted online over the weekend that she harassed a 12-year-old girl who killed herself last month, a sheriff said Tuesday.

Polk County Sheriff Grady Judd said they arrested a 14-year-old girl because they were worried she would continue cyberbullying other girls. The girl is accused of threatening to beat up 12-year-old Rebecca Ann Sedwick, telling her to drink bleach and die and saying she should kill herself, the sheriff said.

Last month, CBS News correspondent Michelle Miller reported that the one message that her mother, Tricia Norman, cannot forget urged Rebecca Ann to kill herself.

Click here to read more at CBS News.

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