A teenage girl has been sexually assaulted by a gang of men in Sydney's west, Australian police say.
In an attack police believe was unprovoked and random, the 14-year-old girl was initially allegedly assaulted by one man in Doonside before his friends joined in on Saturday night.
The first man approached the girl in Bill Colbourne Reserve on Hill End Road about 11pm, police said.
Police have been told the man touched the girl inappropriately before sexually assaulting her.
"The man's five friends then also sexually assaulted her," police said.
The men then fled, leaving the girl to walk to a nearby home where police were called.
The girl was taken to hospital.
Acting police inspector Shane Connad said the girl's parents were in shock.
"They’re horrified as to what happened to their daughter," he told Fairfax Radio Network.
Local detectives, with assistance from the State Crime Command's sex crimes squad, are investigating.