A teenage boy was attacked by a man who stole his bike as he rode along a Sheffield street.
The 13-year-old was cycling near Morrisons on Rotherham Road, Halfway, when a man, believed to be in his 20s, jumped out of some bushes, assaulted him and stole his bike.
Inspector Jason Booth said: "Do you know anything about the crime? Do you know who has the bike or has someone tried to sell it you?"
Call South Yorkshire Police on 101.