A 17-year-old boy is in hospital with a potentially life-threatening head injury after an incident in Derry.
He was found lying in Butcher Street near the city centre in the early hours of this morning.
CCTV operators picked up an altercation between two males at 2.55am.
"Police immediately attended and found a 17-year-old male unconscious on the ground," a PSNI spokesperson said.
"The other person involved had left the scene.
"At this time, the injured male remains in hospital having sustained a potentially life-threatening head injury."
Detectives are appealing for information and witnesses.
"We know that a number of people were in the area at the time and would appeal to anyone who witnessed this shocking incident to come forward," the PSNI said.
