A Mountain View High School teacher faces felony charges after she allegedly had sex with a 16-year-old male student, according to court documents.

Rebecca Mason-Cales, 26, of Boise, is charged with six counts of sexual battery of a child.

The German and history teacher allegedly had sexual intercourse with a student at least six separate times in September and November of 2017, Ada County prosecutors alleged during Mason-Cales’ arraignment Wednesday afternoon. The woman’s lawyer said the sexual contact ended in November, though Mason-Cales allegedly stayed in contact with the student, sending “graphic images as recently as Feb. 12,” prosecutors said.

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Judge Daniel L. Steckel set Mason-Cales’ bond at $20,000 during the arraignment. She has a preliminary hearing set for March 7.

Mason-Cales was arrested Tuesday by Meridian police after the West Ada School District received an anonymous tip earlier in the day. A quick investigation by police yielded evidence that Mason-Cales had been engaged in sexual contact with the student, police said. Police also established the sexual contact began in August 2017.

Mason-Cales graduated from Boise State University in 2015 with a bachelor’s degree in German and secondary education, with a minor in history. According to the Mountain View website, she has been teaching at the school for two years.