Detained Britons Craig and Lindsay Foreman have been charged in Iran with espionage, the country's judiciary news agency has said.
Mr and Mrs Foreman were arrested in January but news of their detention, on unspecified security charges, emerged last week.
Judiciary spokesman Asghar Jahangir said that the couple, both aged 52, had "entered Iran under the guise of tourists" and "gathered information in multiple provinces of the country".
The couple had been on a motorbike trip around the world and had planned to stay in Iran for five days.
The UK Foreign Office's official advice is against all travel to Iran, saying British and British-Iranian dual nationals are at "significant risk of arrest, questioning or detention".
Having a British passport or connections to the UK "can be reason enough for the Iranian authorities to detain you", it adds.
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