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Police are hunting six men involved in the alleged rape of a teenage girl in a Western Sydney car park stairwell.
Police say the 16-year-old has been traumatised by the attack on Saturday night.
The girl was in the Liverpool library forecourt when six men approached her and invited her to meet a mutual friend, police say.
She was then allegedly sexually assaulted by two of the men in the stairwell of a near by car park. The other men failed to stop the attack, police say.
The group of men, described as African in appearance and aged in their 20s, were last spotted walking toward a Macquarie Street shopping centre.
"Something like this is traumatic for anyone but especially at such a young age like that," Inspector Mitch Newton told Macquarie Radio on Tuesday.
Detectives are calling for anyone with information to come forward.
The attack follows two similar assaults in Sydney's west this year.
In February, a girl was allegedly the victim of a pack rape in a Doonside park.
Four teenagers were charged over the alleged attack.
Two months later, two teenage girls were coaxed off a Sydney train and raped in a Fairfield park.