Police have told our reporter Ria Chatterjee that the three boys - 19 year old twins who were in the back seat and their 22 year old brother who was in the front - had parked the car to go into a local shop when 2 men approached.
They had a short conversation before the 2 men fired three rounds into the car, killing Joseph, and leaving his older brother in a stable but critical condition in hospital. Joseph's twin managed to escape unhurt.
Detective Superintendent Gordon Allison of Operation Trident, which tackles gang-related crime, said: "As far as we're concerned, this looks like a tragic case of mistaken identity."
More top news
Mike Wagstaff lights scores of candles underneath vines in the dead of night on his 40 acre vineyard.
the fox, thought to be between four and five-weeks-old, was rescued after a member of the public heard her cries.
Michael Voller, 23, was left with a fractured skull, eye socket and cheek when he was repeatedly punched in the face.