Four young females - one of whom is six months pregnant - say they were attacked by about 10 men outside a Chrischurch bar early on Sunday.

The women, all in their early 20s, left the bar about 3am and walked to their car, parked across from the Hub Hornby car park.

One of the women, a 24-year-old who did not wished to be named because she ''feared retribution'', said the trio were scraping the ice of their car windscreen when the incident happened.

''We walked out to our car when this guy in the car parked next to us was staring at us,'' she said.

''He'd clearly had too much to drink. One of my friends asked him why he was staring at us, and he just got really aggressive.

''He pulled the fingers at us and then he just snapped.''

The man got out of his car and began punching the window of the women's car.

The women tried to drive away, but people spilling out of the bar nearby were blocking the road.

''We tried to drive away but there were people everywhere and we had to stop,'' she said.

''Suddenly about 10 men ran out of nowhere and attacked us. It was like they were all his family or something.

''They were jumping up and down on the car and kicking and punching the windows.

''I thought they were going to smash the windows and they would get to us. We didn't know what to do.''

The women were able to drive away but were left in shock from the incident.

''We just went out for a dance and to have a good time,'' the woman said.

''I was the only one drinking. My other friends were sober and one was pregnant.

''You just don't think something like that would happen. What kind of men attack three females?''

She said $2000 worth of damage had been done to her friend's car.

The woman's mother described the incident as ''caveman behaviour''.

''It certainly is a sad day when our young folk can't go out and enjoy themselves without reprisals,'' she said.

- © Fairfax NZ News