Police are appealing to find a group of four boys seen stealing bikes outside a shop in Friargate.
Two bikes were taken from outside the Footlocker shop in Preston city centre around 3pm on Sunday.
Detectives believe the boys took one bike before returning a short time later to steal a second one.
The first boy is described as black with a short flat top style haircut and was wearing a white tracksuit with a large blue line down the side of the sleeves and bottoms.
The second is described as white and was wearing a black jacket and blue jeans.
The third is described as white with short shaven red hair and was wearing a black tracksuit with a puffer style jacket.
The fourth is described as white with short dark hair and was wearing a navy blue tracksuit with white toggles.
The stolen bikes are described as a Mongoose BMX with a green logo and an orange and white Giant mountain bike with black details on the frame.
PC 632 James Hesketh of Preston Police said: “There were plenty of people in the area when the bikes were stolen and I would appeal to anyone who might have seen this group of boys to get in touch.”
Anyone with information can contact police on 101 quoting crime reference SA1508728 or they can email firstname.lastname@example.org.