An elementary school teacher accused of having sex with a 13-year-old student has been arrested and charged with multiple counts of rape, authorities said.

The teacher allegedly had sex with the boy 28 times during the last week of March, and on at least one occasion allowed the boy's 12-year-old friend to watch, authorities said. She also gave the students alcohol, according to New Castle County Police.

Rachel Holt, 34, a science teacher at Claymont Elementary School, was arrested early Tuesday and charged with rape, providing alcohol to a minor and unlawfully dealing with a child, authorities said.

Acting county Police Chief Lt. Col. Scott McLaren said the boy's father contacted authorities after becoming suspicious that his son was having an inappropriate relationship with his teacher. Authorities said Holt took the boy out for dinner and allowed him to drive her vehicle.

A telephone message left at Holt's home seeking comment was not immediately returned.

Ellen Marie Cooper, a staff attorney for Brandywine School District, refused to discuss Holt's employment status but said a substitute teacher was conducting her classes.