The victim was on his way to school when he was shot on a housing estate in Kesgrave, Suffolk.
Kesgrave High School has confirmed that one of its year 11 pupils was involved in a serious incident, but that other students on the site were safe.
Suffolk Police said a 15-year-old boy was arrested just two hours later – five miles away in Ipswich.
On a Twitter post it wrote there is no « wider threat » to the local community and it is treating it as an isolated incident.
Assistant Chief Constable Rob Jones said: « Our priority is to keep everyone safe and I would like to stress that crimes such as this are extremely rare in Suffolk.
« This is an area with a number of schools nearby and going forward, parents should not be concerned about dropping off or collecting their children. »
© 2020 Sky UK
