Nearly two dozen juveniles have been charged in connection with online threats made against schools in South Carolina since early September, the authorities said on Tuesday.

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According to the news release, the charges are part of a sprawling investigation into more than 60 threats targeting schools in 23 counties since Sept. 4, when the authorities say a 14-year-old gunman fatally shot two students and two teachers at his high school in Georgia.

Threats of mass violence have proliferated on social media since the Georgia shooting and have left law enforcement officials, who traditionally have been limited in their response to threats of possible violence, feeling exasperated. In Central California, several teens have been arrested in connection with threats. In Broward County, Fla., where 17 people were killed at a high school in Parkland in 2018, officials said last week that they had arrested nine students since August in connection with threats of violence.

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