An unknown person hacked a female RAF staffer's Tinder profile, using her online presence to sweet-talk a male Royal Air Force employee and stealing secret information about the US fifth-generation F-35 Lightning II fighter just weeks after the first four jets entered service, according to a report by Mail Online.

Information about espionage attempt appeared first at British tabloid and the UK military confirmed news.

Someone hacked the Tinder profile of a female RAF staffer, then contacted other servicemen posing as this woman and sweet-talked him to sharing information about US stealth fighter. It is unclear who the perpetrator was.

The woman whose account was hacked quickly reported the incident, enabling prompt follow-up and an investigation, according to an RAF warning memo, cited by the Daily Mail.

 “Fortunately, little information was disclosed and the individual whose account had been hacked reported this matter expediently […] Nevertheless, this incident serves to highlight the risk of social engineering and online reconnaissance against social media profiles that disclose links to HM Forces,” the memo, written by the RAF’s Principal Security Advisor, reads.

According to the report, the incident occurred just weeks after the first four aircraft were delivered to RAF Marham Air Base in Norfolk, England.