A group of eight men and a woman launched an attack which is being treated as racially motivated.
Abuse was hurled at a driver in The Queensway, Bognor, before a man smashed the car's rear offside window.
The incident was at 5.30pm on Saturday and police today appealed for witnesses.
The men were wearing England soccer shirts and the woman, with brown hair cut in a bob style, wore blue jeans and a denim jacket.
All were in their 20s.
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