South Carolina authorities will announce Wednesday that Richland County Senior Deputy Ben Fields, the school resource officer who was caught on camera violently flipping a high school student in her classroom, will be relieved of duty, sources told NBC News.

Richland County Sheriff Leon Lott is set to hold a news conference at noon to talk about the internal investigation over the Monday incident at Spring Valley High School in Columbia.

Fields, 34, was suspended without pay as a result of the incident, and the FBI, the Justice Department and state law enforcement are conducting separate investigations.

Lott said at a news conference Tuesday that the female student, who has not been identified, only suffered a rug burn, although her attorney said on ABC’s “Good Morning America” that she “has a cast on her arm, she has neck and back injuries.”

Police say the incident began when the girl became disruptive in her algebra class and was texting on her phone. Her teacher asked the student to leave, and when she refused, an administrator was called in, Lott said.

Fields was then ordered to the classroom. Cellphone videos taken by students show him standing before the girl, commanding her to stand up or be forcibly removed. She refuses to leave. Fields is then seen body-slamming the student to the ground while she’s still in her seat, and then dragging her and her desk across the floor.

A “third video” reviewed by police for the internal investigation shows the girl swinging at the officer’s head after he puts his hands on her, Lott said.

The girl was arrested along with a second student who police say was also “contributing to the chaos.” That student, later identified as 18-year-old Niya Kenny, told NBC News on Tuesday that she witnessed the officer put his arm around her classmate’s neck, and that’s when she fought back.

She said was stunned to see the mayhem in the classroom, and said she “felt something bad was going to go down” when Fields entered the classroom. “He’s known as Officer Slam,” she added.

Lott said Tuesday that he did not know if race was a factor in the case, but didn’t believe so because Fields, who is white, has been dating an African-American woman for “quite some time.” Fields, however, has been the subject of racial bias and excessive force allegations.

The FBI and the Justice Department probes will determine whether the girl’s civil rights were violated in the incident. The president of the South Carolina chapter of the NAACP has called for Fields to be charged with assault.

School district officials also blasted Fields’ actions as “outrageous” and “reprehensible,” and the video itself “shamefully shocking.”

Schools Superintendent Debbie Hamm said the district is strengthening its training efforts with school resource officers to ensure such an incident doesn’t happen again.

A South Carolina high school student who witnessed her classmate being physically abused by a school resource officer was arrested and held on $1,000 for filming the incident.

Niya Kenny, 18, told WLTX she was shocked and disturbed when she saw Officer Ben Fields flipping her female classmate out of her desk and pinning her to the ground for refusing to leave class.

“I was screaming ‘What the f, what the f is this really happening?’ I was praying out loud for the girl,” Kenny told WLTX. “I just couldn’t believe this was happening I was just crying and he said, since you have so much to say you are coming too. I just put my hands behind my back.”

The video, posted Monday by New York Daily News writer Shaun King, shows Fields wrapping his arms around the neck of the pony-tailed girl. He then flips her desk over backwards and throws her onto the ground, saying “put your hands behind your back.”

Kenny said her classmate is only about 5’6″ and said she never saw anything like it before.

“A man used that much force on a little girl, a big man, like 300 pounds of full muscle,” Kenny told the station. “I was like no way, no way, you can’t do that to no little girl.”

Her classmate wasn’t participating in math class at Spring Valley High School in Columbia, and was asked to leave by the teacher. The girl refused, so the teacher called an administrator, who called Fields.

Kenny’s mom, Doris Kenny, said her daughter was just standing up for the girl and said Field’s actions were excessive.

Niya Kenny was charged with “disturbing school,” which her mother questions.

“Who was really disturbing the school?” Doris Kenny asked. “Was it my daughter or the officer who came in to the classroom and did that to the young girl?”

Watch the WLTX report, as posted to YouTube by Loren Thomas, here: