The boy was arrested on suspicion of firearms offences during an the operation at an address in Halton in the early hours of this morning. He remains in custody, police said.
A 17-year-old youth, who was shot and seriously injured in Pasture Road, Harehills, shortly before 6pm on Monday, is continuing to receive treatment in hospital for non-life-threatening injuries. He remains under arrest on suspicion of firearms offences.
Detectives believe the shooting in Pasture Road may be linked to an earlier incident where a shotgun was fired at a house in Devon Close, Woodhouse, causing damage just before 3.40pm on Monday.
A blue Ford Ka, containing three to five masked males, was involved in the incident.
The car was then crashed into a wall at a dead end and then hit a van in Archery Road before driving off.
It was found abandoned a short time later at Hill Top Place, Hyde Park, where the males were seen running off, officers said.
The vehicle, which was carrying the false registration ET57SJU, has been recovered for forensic examination.
Detectives are also looking at potential links to an incident at an address in Roundhay Grove at about 3.20pm where a window was smashed and masked men, armed with what appeared to be a shotgun, left the scene in a blue Ford Ka. No evidence was found at the scene to indicate a gun was fired.
Detective Inspector Andy Farrell, of West Yorkshire Police Firearms Prevent Team, said: “We are continuing to carry out comprehensive enquiries into these incidents and the investigation is progressing with the additional arrest we have made this morning.
“We are building up a picture of the circumstances surrounding these incidents and would still like to hear from anyone who witnessed any part of them or who has any information that could assist us.
“We are particularly keen to hear from anyone who has seen the blue Ford Ka that was used. We have now established that that vehicle was bought and delivered to the Little London area on June 29 and we want to hear from anyone who has seen the vehicle and its occupants since that time or being driven in the various areas around the time of the incidents.
“We are still working on the basis that these incidents have been targeted attacks which are likely to be part of a dispute between criminals.
“We would like to reassure people living in the communities affected by these incidents that we are doing everything we can to identify those involved and bring them to justice.”
Anyone with information is asked to contact Operation Flutewood via 101 or call the independent charity Crimestoppers anonymously on 0800 555 111.