The British couple detained in Iran have been charged with espionage, according to the Iranian judiciary news agency.

The pair, named by their family on Monday as Craig and Lindsay Foreman, are accused of "cooperating with covert institutions linked to the intelligence services of hostile and Western countries".

Iranian state media said last week that the couple were in custody in the southeastern city of Kerman on security-related charges.

According to Ms Foreman's social media, the couple were on a motorbiking trip across the globe to Australia as part of a positive psychology mission.