Northern Ireland's police ombudsman is investigating the conduct of an off-duty police officer in Limavady who appeared to restrain a teenage boy after a snowball was thrown at his vehicle.
A video of the incident, which occurred in Limavady town on 27 February, has been shared over 100,000 times online.
It shows the officer confronting the 14-year-old in a local shop.
According to the BBC website, The police watchdog said it was investigating the incident.
"We are investigating an altercation involving a police officer and a schoolboy," said a spokesman for the police ombudsman.
He added: "Our investigators have begun the process of gathering evidence to assess the appropriateness of the officer's actions during the incident."