A man has been arrested on suspicion of murder in connection with the shooting of a 16-year-old boy in Liverpool on Sunday.
A 20-year-old man from Everton is being questioned at Merseyside police station.
Police were called just after 11:10pm on Sunday following reports of a shooting.
The teenager, named Lewis Dunne, was found on a towpath near Burrows Court, Eldonian Village, by members of the public who performed first aid until emergency services arrived.
Dunne was taken to the Royal Liverpool University Hospital, where he died shortly after his arrival.
The crime scene has been cordoned off for forensic examinations to take place. House-to-house inquiries are also being conducted in the area, and high-visibility patrols have been stepped up in order to reassure the public.
Investigations into the shooting are under way and police are yet to find a motive for the killing.
During a press conference held on Monday, Assistant Chief Constable Ian Pilling said that Dunne received a gunshot wound to the back, the Liverpool Echo reported.
The post-mortem examination into the cause of the Dunne's death took place on Monday evening. Merseyside police have now confirmed the teenager died from injuries caused by a single shotgun discharge to his back.
"It is an absolute tragedy," Pilling said. "This is a 16-year-old boy who had many years ahead of him," he said. "Any victim of gun crime is one too many."
Pilling revealed that Merseyside police had no information about a prearranged fight in the area, and urged anyone who saw the incident to come forward.
"No mother or father expects to bury their child at 16 years old. Someone, somewhere knows who has done this and I urge them to come forward and speak to us," he said.
"Your information, no matter how insignificant you think it is, could help us make significant progress in this inquiry"
Dunne is the third teenager to be fatally shot in the Merseyside area this year. Pilling said that Liverpool is "not normally an area where we have gun crime", and encouraged those carrying firearms to "think twice about it".
"There is always a consequence to this, please don't do it," he added.