A teenager was shot in the hip
as he crossed a footbridge over a canal bridge on Fleetwoods Lane at the border of the St Oswald and Ford Wards.
Merseyside Police said the 18-year-old was attacked as he walked over the bridge just after 21:00 on Saturday.
The boy, who was ambushed by two people, managed to flee the scene to call for help. His injuries are not life threatening.
Police have appealed for information and stepped up patrols in the area.