Police are trying to find a gang of four men who violently robbed a 17 year old boy in Poole.

Three of the group got out of a red hatchback with blacked-out rear windows at about half-ten last Saturday night - and chased the teenager on foot through Broadstone.

They then pushed him to the ground on Birkdale Road and hit him with a glass bottle, slashing his arm - before stealing cash and his bank card.