Video has emerged of a group of teenagers viciously attacking a 12-year-old middle school student in California and running off with his sneakers.

The victim, who has asked to not be identified, is seen in the video outside a home in Elk Grove talking with one of the suspects while sitting on his bike at 3:30pm on Friday.

Three other teenagers can then be seen sprinting at full pace towards the boy, joining the other suspect as they shove him off his bike and begin to punch, hit and kick the defenseless victim.