Three youths were arrested after a teenager was robbed in the street.
The victim, who has not been named, was stopped in St Andrews Road, Portlsade, by a group of eight yobs.
He was ordered to hand over his mobile phone but was not hurt during the robbery on Tuesday at 11.15pm.
Police arrested three suspects nearby a short time later. They were kept overnight in police custody.
They were later released on police bail while investigations continue to identify anyone else involved.
Witnesses should phone Hove police station on 0845 6070999.
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