The Department of Foreign Affairs and Trade says it is working to help the families of three Australians who have been detained by authorities in Iran.

The Times newspaper in London first reported a British-Australian citizen and her Australian boyfriend were detained about ten weeks ago on unknown charges.  The woman was a blogger and had been posting photos and videos of their travels on social media.

Their case is not believed to be related to that of another Australian woman who was jailed a year ago, and is believed to have gotten a ten year sentence.  The Times says that woman, an academic who studied at Cambridge University and was lecturing at an Australian university, is being held in solitary confinement.

"(DFAT) is providing consular assistance to the families of three Australians detained in Iran.  Due to our privacy obligations, we will not comment further," said a department spokesman quoted by the SBS.  "All Australian citizens and holders of dual nationality with Australia who are travelling to or through Iran are urged to follow the travel advice on the DFAT Smartraveller website."

The women also carry British passports and are believed to be held at Iran's Tehran's Evin jail, the facility where 41-year old British-Iranian Nazanin Zaghari-Ratcliffe has been held since 2016 on spying charges.