A previous version of this article stated that the video had reportedly been filmed at Birtley Boxing Club. The police have since clarified that they understand the incident did not take place at the boxing club. We are happy to clarify this.
A video appearing to show a violent attack in a gym is today being probed by police.
Officers from Northumbria Police have appealed for information about the footage, which has been circulating on social media for more than a week. The clip shows a man, appearing to be wearing knuckle-dusters, repeatedly punch another man.
