A Texas police officer is on paid leave after a video shows him throwing a student to the ground, according to NBC News.

The incident happened on March 29 at Rhodes Middle School in San Antonio.

"The video is very disturbing, and we have launched a formal investigation that is being conducted by both district police and administration," Leslie Price, executive director of communications for the San Antonio Independent School District, said in a statement to NBC.

The video was posted online Tuesday night, and the officer was placed on administrative leave yesterday.

Janissa Valdez, the student shown in the video, is in the sixth grade.

She said to local TV station WOAI that she and another girl in the school hallway were going to fight each other, but Janissa wanted to talk to her first. She said she approached the other girl to speak to her, and that's when the officer grabbed her.

Janissa's mother, Gloria Valdez, told WOAI that the floor her daughter hit was concrete.

"She wasn't moving. She was just knocked out. I wanted answers and nobody could give me answers. I contacted the vice-principal. I talked to the officer. He did what he had to do at the moment - those were his words."

Prince said the video was "alarming," but that authorities need to get all the details. She said that, should the investigation determine the officer used excessive force, it will not be tolerated in the school system.

That station identified the officer as Joshua Kehm.