OFFENSIVE BEHAVIOUR: Boy racers 'moon' a resident, who confronted them about drinking alcohol in Parkstone Avenue, where a liquor ban is in place.

An Ilam resident was mooned by young men last night after she confronted them about drinking within the alcohol ban area.

The resident, a 70-year-old woman who did not wish to be named, approached the six young men after they had been speeding up and down Parkstone Ave about 6pm.

They were drinking and ''carrying on,'' so she asked them not to drink in the liquor ban zone.

Supplied OBSCENE GESTURE: Boy racers gesture at a woman, who confronted them about their behaviour.

One of the men gave her "the fingers", and then dropped his pants exposing his buttocks and penis.

The men took items of clothing off to cover the car number plates, then sped off. The resident took photos of them.

The man who had been covering up the number plate was left behind when the car took off.

Supplied POSING: A group of young men are confronted by a resident in Ilam.

The resident believed the men may be the ones, who reportedly harassed young women on Saturday night by pulling down their pants to flash their genitals and shouting obscenities.

''I was just appalled,'' the resident said. ''No young woman should have to put up with that.''

Last night's incident happened at 6pm, which was "not even party time''.

Upper Riccarton and Ilam have had a six-month liquor ban in place since June.

The temporary ban expired on December 10 and will be replaced by another temporary ban on February 1 to align with the start of the university year.

The ban prohibits people from drinking in public or carrying open vessels containing alcohol in public.

Residents Association president Jane Tyler-Gordon said overall behaviour in the area had improved since the liquor ban had been in place.

''There haven't been so many incidents, but this one was a bad one,'' she said.

Anyone with information can contact police on 03 363 7400.