Iranian Foreign Minister Mohammad Javad Zarif reacts as he stands on a balcony with other members of his delegation outside of the current round of Iran nuclear talks, being held in Vienna, Austria July 10, 2015.

Iran has arrested a member of the negotiating team that reached a landmark nuclear deal with world powers on suspicion of spying, a judiciary spokesman said on Sunday.

The suspect was released on bail after a few days in jail but is still under investigation, Gholamhossein Mohseni Ejei said at a weekly news conference, calling the unidentified individual a “spy who had infiltrated the nuclear team,” state media reported.

The deal that President Hassan Rowhani struck last year has given Iran relief from most international sanctions in return for curbing its nuclear program, but it is opposed by hardliners who see it as a capitulation to the United States.

Ejei was responding to a question about an Iranian lawmaker’s assertion last week that a member of the negotiation team who had dual nationality had been arrested on espionage charges.

Tehran’s prosecutor general on Aug. 16 announced the arrest of a dual national he said was linked to British intelligence, but made no mention of the person being in the nuclear negotiations team. On Sunday, Ejei did not explicitly confirm that the arrested person had a second nationality.

Britain said on Aug. 16 that it was trying to find out more about the arrest of a joint-national.

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