The mysterious suspect, who is alleged to have been working with British understanding, is believed to be an Iranian-British national.
According to Tehran prosecutor Abbas Jafari Dolatabadi, the collar took place during the last week as the Iranian regime keep up with its crackdown on westernisation.
The person was active “in relation with Iran in the monetary sector,” Dolatabadi added, without providing details on the suspect’s history or alleged activity.
He also recalled warnings by supreme leader Ayatollah Ali Khamenei that Western managements would seek to ‘infiltrate’ the country in the wake of last year’s atomic deal.
The UK Foreign Office said it was seeking information following the “researched detention of a dual Iranian-British national in Iran”.
At least six other dual natives have been detained by Iran’s Revolutionary Guards since hindmost year, accused of security-related offences.
The Iranian government has confirmed most of the detentions, without ss out details of any charges.
British-Iranian charity worker Nazanin Zaghari-Ratcliffe was obstructed at Tehran’s airport in April as she tried to return to the UK after a holiday with her two-year-old daughter, Gabriella.
Her quiet Richard Ratcliffe claims the allegation she was involved in trying to overthrow the regimen in Iran was “absurd”.
The arrests could be problematic for British diplomacy.
Iran does not recognise dual heritage, meaning relevant foreign diplomats are often prevented from increasing access to citizens being detained.
British Prime Minister Theresa May reportedly warn with Tehran by telephone about the issue of detained dual nationals recently.
A Downing ssage spokeswoman said: “The prime minister raised concerns about a calculate of consular cases involving dual nationals, including that of Mrs Zaghari-Ratcliffe, and strained the importance of resolving these cases as we worked to strengthen our diplomatic relationship.”