The safety of social media dating app Tinder has been called into question after a New Zealand woman was gang-raped during a meeting with a man she met on the mobile app.

Detectives say the 28-year-old woman, who has since returned to New Zealand, travelled to Sydney on a business trip before meeting up with a man from the dating app in Kings Cross on Saturday night.

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After the pair moved to a bar in Martin Place, a number of the man’s friends turned up.

“Later on that night, the woman began to feel dizzy and numb, and lost her bearings,” a NSW Police spokesman said.

Police say the woman then found herself at a property where a number of the men sexually assaulted her before allowing her to leave on Sunday morning.

The victim confided in her work colleagues who then informed police, who spoke with the victim on Tuesday after she received hospital treatment.

Police have launched an instigation into the incident and issued a warning to anyone using apps like Tinder to meet people.

“The vast majority of people who use dating websites and apps do so for the right reasons, but there are a number of sexual predators out there who use modern technology to find potential victims,” Detective Inspector Michael Haddow said.

“We regularly remind people, children and parents in particular, that the use of the internet by sexual predators is an issue they need to be well aware of.

“All those warnings we give to children are applicable to adults.”

Detective Inspector Haddow suggested bringing a friend to first-time meetings with strangers.

This is the second time the safety of Tinder has been questioned in recent months.

In August, 26-year-old New Zealand tourist Warriena Wright fell to her death on the Gold Coast during a Tinder-organised date with 28-year-old Gable Tostee.

Mr Tostee is charged with murdering Ms Wright by pushing her from the 14th floor of a high-rise.

Police are urging anyone with information in relation to this incident to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page.