Convicted IRA bomber Sean Kelly has been interviewed by police following an incident in a north Belfast shopping centre, it is understood.
Footage emerged on social media on Saturday showing Kelly being restrained by passers-by outside the Eurospar at the Flax Centre in Ardoyne on Saturday.
Mobile phone footage of the row has since been viewed thousands of times.
Detective Inspector Tom Phillips said a man had attended Musgrave police station yesterday morning by prior arrangement.
"A report will now be prepared for the Public Prosecution Service," the PSNI officer said.
Kelly (46) was convicted of the IRA's 1993 bombing of a Shankill Road fish shop which killed nine people, including two children.
More than 50 others were maimed in the no warning blast, for which Kelly received nine life sentences.
Another bomber, Thomas Begley, was also killed in the blast.
Kelly was released early from prison in July 2000 under the terms of the Good Friday Agreement.
Justice Minister Naomi Long said on Sunday that she had reported the incident to police after seeing the footage.