SPRING, Texas -- A high school teacher has been accused of having sex with a student in a classroom, KPRC Local 2 reported Tuesday.

According to court documents, the assistant principal of Westfield High School caught English teacher Shannon Hrozek, 42, performing a sex act on a 16-year-old male student on Jan. 3.

Investigators said the two were discovered after a janitor noticed that Hrozek was in a classroom with the student and the lights were off.

"An employee reported something immediately so we have to applaud that employee for letting someone know immediately," Spring Independent School District spokeswoman Regina Curry said.

Hrozek was arrested and charged with sexual abuse of a child. She is out of jail on $50,000 bond and is scheduled to appear in court on Wednesday.

District officials said they immediately began an investigation and placed Hrozek on administrative leave pending the outcome. A letter has been sent to parents to make them aware of the allegations.

Hrozek has worked at the school since August 2004.

Hrozek is the third teacher in the Spring Independent School District and second at Westfield High School to be accused of having an inappropriate relationship with a student this year.

Spanish teacher Carlos Hector Valencia was accused in December of having sex with a 17-year-old female student in the agricultural barn at Westfield High School. He is scheduled to be arraigned on Jan. 16.

Westfield High School students can anonymously report inappropriate student/teacher relationships online.

Duett Middle School teacher Alison Mosbeck was accused in October of having an inappropriate relationship with a 14-year-old male student. According to court documents, Mosbeck told investigators that the relationship began when she took the boy to a festival in Humble in November 2006.

"First of all, incidents of this nature are never acceptable," Curry said. "We're never pleased to report them. The fact that it happens one time is unacceptable, so certainly happening more than once is something we're not pleased to report. However, we are pleased that the heightened awareness of these incidents is causing people to come forward and make reports."