Image Credit: ABC News

A California high school teacher is under investigation after her arrest on charges that she allegedly had sex with a student.

Megan Denman, 29, a social sciences teacher at Fresno's Hoover High School, was arrested Monday on one count of sex with a minor and two counts of  oral copulation with a person under 18, according to  the Fresno Police Department and the Fresno United School District.  

The investigation is ongoing, and no evidence has emerged that other students were involved or that any  illegal activity took place on school property.

Denman was released from Fresno County Jail Tuesday evening, according to ABC News affiliate KFSN.

"As we all know, there have been incidents throughout the state of teachers taking advantage of the student-teacher relationship," said Fresno Unified Superintendant Michael Hanson said  in a news release.  "Unfortunately, we have learned of an alleged inappropriate relationship between a teacher and student in our own district.  Words cannot describe my deep disappointment in this alleged breach of teacher-student relationship. "

Denman has been placed on paid administrative leave.