A 15-year-old was robbed of her mobile phone by two older girls who jostled her in an alley.
She was approached in an alleyway between Normanton Avenue and Marshall Avenue, Bognor. The thieves snatched her phone and made off.
Police say both girls were 16 or 17. The first was chubby and had shoulder-length dyed blonde hair. She wore a red jacket and long-sleeved white T-shirt.
The other was 16 or 17 and had long, dark brown hair. She was slim, 5ft 11in tall and wore dark trousers.
Bognor police are appealing for witnesses to the attack, which happened at 7.20pm on Thursday.
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