Judiciary spokesman Gholamhosein Mohseni Ejehi
Judiciary spokesman Gholamhosein Mohseni Ejehi (pictured) wouldn't identify the suspect by name but said a man was released on bail and his charge 'not yet proved'.
Iran has detained an Iranian-Canadian member of its nuclear negotiation team on suspicion of 'infiltration,' the state's official news agency, IRNA, has reported.

Abdolrasoul Dorri Esfahani, a member of the Ontario Institute of Chartered Accountants in Canada, was identified as the suspect by hard-line news outlets Wednesday.

'The report is correct,' judiciary spokesman Gholamhosein Mohseni Ejehi told IRNA Sunday. 'He was released based on bail. Yet, his charge is not proved.'

Ejehi would not elaborate on the case or identify the suspect by name. However IRNA called the suspect an 'infiltrating element.'

Esfahani was reportedly both an adviser to Iran's Central bank and a contributor to last year's landmark nuclear deal between Iran and world powers.

His role in the latter job was to work on a team that aimed to lift economic sanctions under one of the the main negotiators.

After the 1979 Islamic Revolution, Esfahani reportedly served as a member of the Iranian team at the Hague.

They worked on disputes between Iran and the United States over pre-revolution purchases of military equipment from the US by Iran.

On Monday Iran's Foreign Ministry denied the report and said none of the members of its nuclear negotiation team was detained.

Global Affairs Canada, the government department that oversees diplomatic matters, is aware of a Canadian citizen being detained said spokesperson Diana Khaddaj when asked about Esfahani.

She declined to elaborate due to privacy concerns.

It remains unclear why Esfahani is under investigation, though dual nationals have been increasingly targeted by security forces since the nuclear deal and accused of a variety of security-related crimes.

However Esfahani's release on bail suggests his case is not considered serious by Iran's Iranian judiciary, which traditionally does not offer bail to suspects accused of major crimes.

The nuclear deal remains a sore spot for Iranian hardliners, but it has boosted the popularity of moderate President Hassan Rouhani and helped his supporters make major gains in March parliamentary elections.