Police are hunting a young man involved in a shocking assault which was caught on camera at the weekend.

Footage has captured an attack at Pirrama Park in Pyrmont where two 16-year-old girls were allegedly assaulted on Saturday night.

Three men – aged 23, 29 and 21 – were arrested shortly after and charged with affray and common assault.

NSW Police Acting Superintendent Paul Dunstan told Jim Wilson two of the girls have mild headaches, cuts and bruises following the brawl, while a third was concussed.

“There is a fourth man, Jim, that we’re also trying to locate and identify, and that’s what we’ve spent most of our day today doing to be honest.”

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The fourth man is described as being of Caucasian appearance, aged in his 20s, and was wearing a grey hoodie, dark pants and blue sneakers.