Morgan Roof, 18, was arrested Wednesday at A.C. Flora High School after a school administrator contacted the school resource officer, Richland County Sheriff Leon Lott said in a news release.
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She is charged with two counts of carrying a weapon on school grounds and one count of simple possession of marijuana.
No one was hurt.
A judge set her bond at $5,000 and said she could not return to the school. She was screened for a public defender. It was not known if she has an attorney yet.
Investigators say Roof also posted a Snapchat about the National School Walkout day protest against gun violence that alarmed fellow students, but no charges were filed for that message.
School principal Susan Childs posted a letter to parents on the school's Twitter page explaining what occurred while students walked out to remember the 17 killed in the Parkland, Florida, Valentine's Day school shooting.
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"A student used social media to post a hateful message. The posting was not a threat, but was extremely inappropriate. That student was dealt with in a swift and severe manner as the posting caused quite a disruption," Childs wrote.
South Carolina Gov. Henry McMaster issued a statement Wednesday night praising school administrators and the sheriff's department, saying a "potential tragedy" was avoided at the school.
Dylann Roof was convicted of fatally shooting nine African-American parishioners at a Charleston church in 2015. A week before his sentencing in January 2017, Roof met with his family and told his sister he would invite her to his execution.
A video recording of one of the visits showed Roof's sister trying to make small talk. Roof asked his sister what she wanted to do as a career, scoffing at the unoriginality of her dream to be a nurse. He told her that he no longer had to worry about making a living because he was in prison.
Roof's sister smiled back. "You're a professional dumbass," she said.