A 14-year-old boy was punched to the head and stomach by a gang of teenagers as he walked home.
The boy was walking along Victoria Avenue, Keighley, when he was was approached by the group, who asked his age before beginning their attack.
Police have issued an appeal for witnesses to the incident on July 22.
All are described as Asian and in their mid-teens. One had distinctive mohawk-style hair.
Witnesses are asked to contact the police non-emergency number 101.