Nelson Police are seeking help from the public in relation to an assault outside the public toilets in Buxton Square Carpark on Sunday, October 21.
At about 1am a 20-year-old woman was thrown to the ground and knocked unconscious by another female unknown to her.
"When the victim came to, she was helped by two unknown females, and then got into a white car outside the toilet block," a police spokesperson said.
"The female who assaulted the victim, along with around six other females, surrounded the car and hit it until it was able to drive away."
Nelson Police want to speak to anyone who witnessed the attack, or anyone who has information that could assist in their investigation.
"If you can help, please call Nelson Police on 03 546 3840," the spokesperson said.
