A white Texas police officer was placed on restricted duty Thursday while an internal investigation looks into a video footage showing the officer wrestling a black woman to the ground before arresting her and her two teenage daughters.

The Fort Worth officer, whose name hasn't been released, responded to a call for service after a woman, Jacqueline Craig, argued with a man who she said had physically confronted her seven-year-old son for littering.

In the cellphone video of the Wednesday incident, which contains graphic language and profanity, Craig can be heard telling the officer that the man had "grabbed and choked" her son.

The officer engages Craig in a conversation that quickly escalates. He asks why she hadn't taught her son not to litter. Craig says regardless of whether the boy littered, the man did not have the right to "put his hands on him." The officer says, "Why not?"

Dallas civil rights attorney S. Lee Merritt, who is representing Craig and her 19-year-old daughter, Brea Hymond, said at a news conference Thursday night that no report was filed on the alleged physical confrontation between the seven-year-old and the man. He said he plans to "request the prosecutor pursue charges" against the man.

Merritt added that he will look into the officer's training and background once he has been identified.

Police investigating

The Fort Worth Star-Telegram reported that Craig's 15-year-old daughter also was arrested. Fort Worth police, in a statement Thursday, confirmed there were three arrests.

Online records show Craig and Hymond were released from jail. The Star-Telegram reported that the 15-year-old was released, too.

Jacquelin Craig and her two teenage daughters are finally headed home! <a href="https://twitter.com/hashtag/thoushallnotlitter?src=hash">#thoushallnotlitter</a> —@MeritLaw

Police said in their statement that they have reviewed the officer's body camera footage, but will not be releasing it or many other details because state law regarding internal investigations doesn't allow them to do so.

"We acknowledge that the initial appearance of the video may raise serious questions," the police statement said. "We ask that our investigators are given the time and opportunity to thoroughly examine this incident and to submit their findings."

Statement regarding Facebook Video: <a href="https://t.co/omjlHFnXxy">pic.twitter.com/omjlHFnXxy</a> —@fortworthpd

The video, viewed more than 1.1 million times, was posted on Facebook by a woman identified by the Dallas Morning News as Craig's niece, Porsha Craver. Her video is a cellphone recording of a live video streamed by Hymond on Facebook, she said.

In the video, one of Craig's daughters tries to push her mother away from the officer, but the officer forces Craig and the teen to the ground. He points a stun gun into Craig's back and then at her daughter when she tries to approach.

The video appears to skip ahead at points, which Craver says happened when the recording was interrupted by incoming calls, according to the Morning News.

'Fundamental injustice'

The head of the American Civil Liberties Union of Texas said in a statement Thursday that she's disappointed the officer is being given 48 hours to prepare a report on the incident.

"This incident and countless others like them demonstrate that for people of colour, showing anything less than absolute deference to police officers — regardless of the circumstances — can have unjust and often tragic consequences," executive director Terri Burke said.

"This fundamental injustice is also a threat to public safety," Burke said. "If a black woman in Fort Worth can't call the cops after her son is allegedly choked by a neighbour without getting arrested, why would she ever call the cops again?"

The Morning News reports that about 150 people gathered in downtown Fort Worth Thursday night to protest the arrests.

Police have issued a safety alert after someone Facebook-shared the video with a threat directed at white police officers, thee Star-Telegram reports.