The Police Ombudsman's Office has appealed for information about an incident during the Twelfth of July parade in Limavady.
The Office has received a complaint about an altercation between a parade spectator and police close to the junction of Roemill Gardens and Roemill Road. A police officer used CS Spray during the incident, which happened at around 5pm.
Anyone who saw what happened, or who may have recorded video of the incident, is asked to contact the Police Ombudsman's freephone witness appeal line, which is 0800 032 7880.