These two young men were caught on camera at the same time two 15-year-old boys were attacked in Chelmsford High Street.
One of the victims was punched in the head by two assailants, while his friend was also struck in the head after refusing to hand over his mobile phone to two suspects who tried to snatch it.
Both suspects are described as being in their late teens. One was black, around 6ft 2in tall, of slim build, with cropped black hair. The other was described as being of Mediterranean appearance, 5ft 9in tall, of average build with dark messy hair.
Neither boy was badly hurt during the assault on October 31 but they were both left upset by the attacks.
Anyone who recognises the suspects is asked to call DC Martin Amundsen at Chelmsford Police Station on 101 or ring Crimestoppers anonymously on 0800 555 111.
