The Police Ombudsman's Office has appealed for witnesses to the drowning of a teenager in the River Faughan in Derry to come forward.
15-year-old Kyle Bonnes from Tullyally, died after being pulled from the river on Wednesday. The incident happened in the Drumahoe area just after 5 o clock.
The boy was running from police when he entered the water.
Officers tried to help him but he was pulled from the river in an unconscious state and died a short time later.
Police said the teenager ran off with another youth when they arrived to investigate reports of a disturbance on the Glenshane Road.
The boy's body was recovered by members of Foyle Search and Rescue.
A statement from the Ombudsman's office said investigators had been at the scene through the night co-ordinating forensic, mapping and photography work.
"We would like to speak to anyone who may have witnessed what happened to come forward," the statement continued.
The Police Ombudsman can be contacted on 0800 032 7880.
The chairman of Derry District Policing Partnership, Joe Miller, said they would "monitor the outcome" of the Ombudsman's investigation.