AUSTIN (REUTERS) - A Dallas-area policeman seen in a viral video tossing a bathing suit-clad, black teenage girl to the ground resigned on Tuesday from the McKinney Police force, local broadcaster Fox 4 and others cited his lawyer as saying.

McKinney Police Corporal Eric Casebolt had been placed on administrative leave pending an investigation of how he responded to the disturbance on Friday in the city about 30 miles north of Dallas, an incident that has raised fresh questions about racial bias in U.S. policing.

In the video, Casebolt is seen shouting obscenities at black youths in a multiracial crowd, shoving a black teenage girl, briefly pointing his gun at black youths and throwing the girl in her bathing suit to the ground, burying his knees in her back.

The seven-minute video, viewed 9 million times on YouTube as of Tuesday morning, shows officers responding to the incident, which police said started when scores of young people attended a party with a disc jockey at a community pool and refused requests to leave.

Hundreds of people rallied in McKinney on Monday night demanding the firing of Casebolt. He has not spoken publicly about the incident and was not available for comment.