Two men have been charged over an attack on a group of women who were celebrating a hen's night in Sydney's CBD.

One woman, 29, was taken to hospital with a suspected broken collar bone and three others, aged 31, 25 and 29, suffered bruises and cuts after their group was attacked outside a George St fast food outlet on Saturday.

Police said the incident occurred about 12.20am at Hungry Jack's on George Street, near Hunter Street.

It is alleged a man assaulted the women before leaving the location.

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Police will allege a second man, aged 43, assaulted one of the 29-year-old women, causing her to fall to the ground.

She was treated at the scene by NSW Ambulance Paramedics before being taken to St Vincent's Hospital for treatment for a broken collar bone.

Two other women were also taken to St Vincent's Hospital suffering bruising and abrasions, but were released a short time later.

Helping police with their investigations was a 69-year-old man who reportedly intervened to stop the offender, but was allegedly assaulted and suffered facial swelling. 

A passerby, Celio Agostinho, who was leaving a nearby McDonalds restaurant, saw the incident and tackled one of the men. 

"He was being held by some guys working at Wynyard station, and they let him go for a second and he took off," Mr Agostinho said.

"I didn't even think, I just stepped into him and tackled him."

A 44-year-old man was charged with five counts of assault, while a 43-year-old man was charged with assault occasioning grievous bodily harm and common assault.

 

 

with AAP