Five teenagers were arrested in connection with a knifepoint robbery in Peterborough.
A 16-year-old boy was approached in the city's bus station by seven youths and several valuable items were stolen at about 3.30pm on January 17.
Five teenagers were later arrested and they have since been released on bail.
Police have since released CCTV images of two youths they would like to speak to in connection with the incident.
Anyone with information is urged to contact police via Cambridgeshire Constabulary's website using reference 35/3906/24.
Anyone without internet access should call 101.
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