A dramatic brawl on the Montgomery, Alabama, riverfront pitted people standing up for a Black riverboat worker against a group of white people who began beating him for telling them to move their illegally parked pontoon.

The Saturday night fight, which was captured in multiple videos posted to social media, appeared to unfold largely along racial lines. And many social media users celebrated footage of the riverfront dust-up, which showed the white assailants get the tables turned on them by Black people who rushed to the riverboat worker’s aid.

“This is not … 1963 anymore,” read one comment, alluding to the year before the signing of the Civil Rights Act, which prohibited discrimination on the basis of race.

Montgomery police confirmed they responded to reports of a disturbance on the 200 block of Coosa Street in the area of the Montgomery riverfront park. They said officers had “located a large group of subjects engaged in a physical altercation”.

“Several subjects have been detained, and any charges are pending,” a police statement added, without elaborating.

The brawl appeared to start when a pontoon boat prevented a larger river boat from docking. When a Black riverboat worker objected, he was attacked by a group of white men.

The conflict escalated when a group of about six Black men from the riverboat confronted the white party. Cheered on by bystanders, they beat three white men and two women, at least one of whom could be seen first striking others by running up and throwing her body into them from behind.

At least two of the women jumped or were pushed into the river. A third was beaten over the head with a folding chair, video showed.

After the arrival of police officers, the brawl subsided – and then briefly reignited before police began cuffing the participants, Black and white.

NBC station WSFA of Montgomery reported that four arrest warrants have been issued in connection with the altercation and “there’s a possibility more will follow after the review of additional video”.

Police also appealed to the public for help in determining what had happened.