The Police Ombudsman is appealing for witnesses to come forward in relation to an incident outside a nightclub in Co Tyrone.
The Irish News revealed this week that a probe has been launched after a video recording emerged that appeared to show a PSNI officer kicking a teenager around the head while he was being held on the ground.
The clip shows a uniformed officer kicking Shea Somerville outside of the Time nightclub in Cookstown.
In the footage, two officers are pictured kneeling over the teenager, having been detained alongside another male who was not arrested.
Lawyers for the 16-year-old from Coalisland say he has been left with “serious injuries”.
It has been alleged that Shea was further assaulted in the back of a police car while being taken to Dungannon station.
The Police Ombudsman said it is now probing a complaint.
“We would be keen to speak to any bystanders present at the time of the incident and particularly keen to speak to anyone who may have recorded mobile phone footage,” a spokesman said.
“If you believe you can help, please call our witness appeal line on 0800 032 7880.”
It is understood that no police officers have been removed from duty.
A PSNI spokesperson said a 16-year-old boy was arrested on suspicion of three counts of assault on police, following a disturbance in Cookstown in the early hours of Sunday December 8.
“The disturbance occurred after patrol officers stopped to assist an injured man in the James Street area,” they said.
“The boy was later released on bail to allow for further inquiries.