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A former Philadelphia high school English teacher was arrested after police say she sent a video of herself performing a sex act, along with nude photos, to her teenage student.

Stephanie France Luckey communicated with the boy through a private Twitter account set up in April, the Berks County District Attorney’s Office told the Inquirer Daily News.

Authorities began investigating Luckey in June after receiving a complaint from Childline and the Berks County Children and Youth Services that Luckey allegedly had “inappropriate contact” with the 17-year-old boy, the DA’s office said via the Inquirer Daily News.

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The student told police he and Luckey would kiss in her classroom after school.

During an interview with detectives in July, Luckey admitted to the allegations. She resigned from her teaching position at Muhlenberg High School in August.

The 37-year-old faces charges of unlawful conduct with a minor, corruption of a minor, and sexual abuse.