A teenager needed 15 stitches and lost several teeth and another suffered a broken nose after a large-scale fight broke out.
Police think a group of about 14 men, aged in their 30s, set upon a group of six teenagers.
The fight broke out at 1.25am last Friday morning in an area adjacent to the Skate Park on the Esplanade at Bognor.
Anyone with any information should contact PC Jon Woolley at Bognor police on 0845 6070999.
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