While I'd take the police identifying it as an Air Rifle with a pinch of Salt it's going to be a messy one.
While it in no way justifys the Lad being shot he did technically tresspass, he climbed over the fence without asking and while it is a new build estate they haven't said what its acctually like normally day to day other than the mothers statement, they can still be rough so someone could've thought they were defending themselves when they heard him come over the fence.
Not good by any means and will probably set Pearly clutchers off, best we can do is just prove we as a majority are responsible in our sport and misuse is a rarity.