Police said the 12-year-old victim was walking along the alleyway between Monks Recreation Ground and North Road about 5pm on Sunday November 20 when he was approached by a group of teenagers.
He was punched to the face several times and had his phone stolen, before two older boys attempted to intervene and the boy ran away, police said.
Investigating officer Detective Constable Sebastian Day said: “We’re very keen to speak to the two boys who intervened, as they may be able to provide valuable evidence. We would encourage them, or anyone else who saw what happened, to report it online at https://sussex.police.uk/contact-us/response-to-appeal/ or call 101, quoting serial 1095 of 20/11.”
A spokesperson for Sussex Police said: “A 17-year-old boy from Lancing, arrested on suspicion of common assault and two counts of robbery, has been bailed until 30 December pending further enquiries.
“A 12-year-old boy from Hove, arrested on suspicion of two counts of robbery, has been bailed until 29 December pending further enquiries.”
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