A STRIKE Force set up to investigate the alleged kidnapping and gang rape of a teenage girl in Sydney's north west has found the incident did not occur.

The 17-year-old alleged she was abducted while walking home from a party along Merindah Rd at Baulkham Hills at 1am on Sunday March 3.



The girl alleged she was assaulted in the car by a group of five men before being dumped in a neighbouring suburb three hours later.



NSW Police formed Strike Force Mikkelsen comprising of officers from the Sex Crimes Unit and the Hills Local Area Command to investigate the incident.



After an exhaustive investigation which involved interviewing scores of witnesses - including the girl and her family - detectives this morning revealed the "incident did not occur''.

Sex crimes squad commander, Detective Inspector John Kerlatec, said he was frustrated full-time police officers were diverted to the case and at the anguish caused to the community.

"False reports do tie up valuable resources,” he said. "Whilst I'm relieved that the assault didn't occur, I'm abundantly aware of the angst it has caused.”

The girl at the centre of the claims is understood to be in a fragile state and police are conducting enquiries into her movements on the night.

At the time of the alleged assault specialist rape victim counsellors and investigators spent hours with the 17-year-old.

She detailed a horrific attack by five men leading police to label her ordeal “as bad as it gets”.

Students at the girls high school were called into a meeting and spoken to about the dangers of walking alone and locals said they were afraid to go out alone at night.

Det Insp Kerlatec said victims of assaults should not be afraid to come forward, stressing police take all reports seriously.

"We do believe you when you walk through our door," he said.