A woman who told police she was gang-raped after meeting a man through mobile dating app Tinder has withdrawn her statement and police are no longer investigating.

The New Zealand woman, 28, told police she had been sexually assaulted by at least three men after she organised to meet a man she had been chatting to through the dating app on Saturday night.

Police have warned about the risks of dating strangers whom you have met online. Credit:Simone De Peak

The woman, who was on a business trip, said she had met the stranger at a Kings Cross restaurant before going with him to a bar in Martin Place.

NSW Police said the woman retracted her statement on Thursday night and, after a five-day investigation, police had decided there was not enough evidence to follow through with any charges.