Brandy Mills, 33, of Union City, and Teresa Mendenhall, 38, of Portland, are seen in the video, encouraging the girls, ages 16 and 17, to fight and stopping others from trying to break it up, Capt. Bill Bradbury said.

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Both women were arrested on charges of neglect of a dependent, a Class D felony.

If convicted, the women could face up to an 18-month sentence. Both were later released from the Randolph County Jail on $5,000 bond.

Bradbury said police were alerted to the fight on Friday by someone who said they witnessed it take place in Harter Park.

The video was later posted on the Facebook wall of a teen who did not take part in the fight, police said.

Teresa Mendenhall and Brandy Mills

Police said the girls involved in the fight could be charged as juveniles with disorderly conduct.

"Officers also witnessed several other adults and teenagers watching as the fight was ongoing, none of which contacted the police department," Bradbury said. "Nearly 20 onlookers have been identified and have been … (banned) … from entering the park in the future."

Union City Police Chief Cobie Wells said he was flabbergasted by the people who stood by and didn't intervene.

"We will not tolerate acts like these, and we will seek criminal charges against anyone involved, including those who stand by and do nothing," Wells said in a news release.

Police said they would have no further comment on the case.