The Iranian Foreign Ministry spokesman says Tehran will use all its capabilities to protect its citizens, especially academic Sharam Amiri, who was abducted last year by the US, Press TV reported.
The documents related to the abduction of Shahram Amiri by the CIA have been handed over to the Swiss ambassador in Tehran, since the Swiss Embassy hosts the US interests section, Ramin Mehmanparast told reporters on Saturday.
"Therefore, in light of the US government's obligations and the promise of the State Department spokesman, we expect US officials to announce the results of their investigations about this Iranian citizen as soon as possible," he added.
He went on to say that Amiri's recent video message confirmed the Islamic Republic's stance on the issue, and added that Iran still holds the US responsible for the abduction and the safety and wellbeing of its citizen.
Taking individuals hostage in order to achieve political objectives is unacceptable, Mehmanparast said, adding that Amiri's family and public opinion in Iran demand the return of their citizen.
Shahram Amiri, a researcher at Iran's Malek Ashtar University, said in a video message in June that he had been kidnapped by US and Saudi intelligence agents last year while on umra pilgrimage in Saudi Arabia.
"As we have repeatedly stated, we believe that Alireza Asgari has also been abducted by US forces," Mehmanparast stated, adding that Iran expects the US to accept its responsibility toward him and to help determine Asgari's fate.
Alireza Asgari retired as Iran's deputy defense minister two years ago.
He was on a business trip to Turkey, where he checked in at the Hotel Ceyran in Istanbul on December 7, 2007. He disappeared two days later.