A teenage boy was threatened with a knife by three others while he was in a play park in South Bristol.
The group of males chased the victim and two of his friends, a male and female also in their teens, in the Headley Park area on January 29.
Police say the boy was threatened with a blade, which was held against his stomach.
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The group of males were described as white and aged around 15 and 16 years old, according to police, and one of them was said to be riding a black moped.
Officers are now seeking information to help them catch the culprits.
Avon and Somerset Police launched an appeal today (Thursday, February 30.
A spokesperson said: "The incident took place in the Headley play park between 10pm and 10.10pm.
"The offenders are believed to have used the pedestrian footpath that connects Cater Road to Durville Road to enter the area. It is not known which direction they left in.
"Police want to hear from anyone who was in the Headley Park, Pinhay Road, or Durville Road areas at the time of the incident and may have seen the offenders.
"They’d also like to hear from anyone in these areas who may have relevant dash cam or CCTV footage from this time and date.
"If you can help, please call 101 quoting reference 5222023684."
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