The United Kingdom should release immediately Iran's former ambassador to Jordan,
Nosratollah Tajik, who is currently being held in the UK, Deputy Foreign Minister for Consular, Parliamentary and Iranian Expatriates' Affairs Hassan Qashqavi said, Press TV reported with reference to Mehr News Agency.
Qashqavi also noted that Americans cannot extradite someone from Britain under UK's human rights laws.
"In several meetings with Mr. Tajik and his lawyers, we found out that he is in appalling physical conditions," he further explained.
The senior Iranian official added that a number of British doctors and psychiatrists have sent medical reports on Tajik's critical health condition to Britain's Home Office.
According to Qashqavi, all the reports verified that the former Iranian envoy is suffering from different diseases and that his well-being is badly undermined.
The Iranian official went on to say that Tajik's mental health was also in danger as he had been under house arrest in Britain for nearly five years.
Tajik was arrested in the UK in 2006. He was accused of involvement in nuclear deals in violation of US sanctions on the Islamic Republic. The United States is pressuring British officials for Tajik's extradition.