Youths Rob Pensioner
The 73-year-old man from Worthing was outside the Post Office in North Road when he was approached by three youths, who pushed him over.
They then assaulted him and snatched his wallet from his trouser pocket.
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Hide AdBut the victim got up and hit one of them in the face before they ran off.
The man was taken to Worthing Hospital suffering from bruising to the arm, leg and face.
The robber, who was hit by the man, was described as male, aged between 18 and 20, 5ft 10in, of stocky build and had his hair in a long ponytail.
He wore a light-coloured jacket.
Anyone with information about the incident should call 0845 6070999.