HOUSTON (CBS/KHOU) When their teacher backed one of their classmates into a corner, students at a Houston-area charter school thought it was a joke – but it allegedly turned into a shocking and brutal beating that was caught on tape.

Cell phone video of alleged beating at Houston-area school. (KHOU)

Sherri Davis, a science teacher at Jamie’s House Charter School, allegedly backed 13-year-old Isaiah Johnson into a corner and began beating him while his classmates watched.

The boy’s mom filed a police report with the Harris County Sheriff’s Office, who is actively investigating the beating.

For almost one minute, a teacher was caught on a cell phone camera terrorizing a student. She beat, kicked and slapped the boy as classmates cheered and laughed.

“The video is absolutely horrifying,” said Sue Davis, spokesperson for Jamie’s House Charter School.

Davis was placed on administrative leave when school officials learned of the incident in late April, but was fired Monday when officials saw the video.