A gang of five masked teenagers viciously attacked a 14-year-old boy as he waited for a bus.
The gang went over to the boy before kicking him in the ribs.
As he lay on the ground the five attackers continued to punch and kick him for about six minutes.
The attack took place on High Street, Crofton at 5.40pm on Tuesday.
Police said the five attackers were seen running off towards The Slipper public house, on Santingley Lane.
The five suspects were all aged about 15 and wearing balaclavas.
One was wearing a black coloured tracksuit bottoms and a black coloured hooded top.
Anyone with any information should contact PC Sarah Young of the North West neighbourhood police team on 101.