VIENNA -- An Iranian envoy is denying allegations that Tehran worked on developing nuclear arms at a military facility and then covered up the site to hide suspected clean-up efforts.

The comments by Ali Asghar Soltanieh are a rare instance of Iran acknowledging concerns about the Parchin site. The International Atomic Energy Agency suspects a building there was used to test explosives needed to set off a nuclear charge.

Iran denies any interest in nuclear weapons but has avoided public comment on Parchin fears while refusing agency experts access. Satellite images from last month appear to show that a tarp has been put over the suspect building, preventing satellite monitoring of an alleged clean-up.

Soltanieh, Iran's IAEA delegate, said Wednesday without elaboration that the activities have "nothing to do" with agency concerns.

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  • In this Nov. 30, 2009, file photo released by the semi-official Iranian Students News Agency (ISNA), Iranian technicians, work with foreign colleagues at the Bushehr Nuclear Power Plant, just outside the southern port city of Bushehr, Iran. (AP Photo/ISNA,Mehdi Ghasemi, File)

  • FILE - In this Saturday, Aug. 21, 2010, file photo, an Iranian security directs media at the Bushehr nuclear power plant, with the reactor building seen in the background, just outside the southern city of Bushehr, Iran. (AP Photo/Vahid Salemi, File)

  • In this photo released by the official website of the Iranian presidency office, Iranian President Mahmoud Ahmadinejad, second right, welcomes Egyptian President Mohammed Morsi, for the opening session of the Nonaligned Movement, NAM, summit, in Tehran, Iran, on Thursday, Aug. 30, 2012. (AP Photo/Presidency Office)

  • This photo released by the official website of the Iranian supreme leader's office, shows the opening session of the Non-Aligned Movement (NAM) summit, in Tehran, Iran, on Thursday, Aug. 30, 2012. (AP Photo/Office of the Supreme Leader)

  • In this photo released by the official website of the Iranian supreme leader's office, Supreme Leader Ayatollah Ali Khamenei, center, Parliament Speaker Ali Larijani, right, Chief of Expediency Council, Akbar Hashemi Rafsanjani, second right, President Mahmoud Ahmadinejad, second left, and Judiciary Chief Sadeq Larijani, left, listen to Iran's national anthem, at the opening session of the Non-Aligned Movement (NAM) summit, in Tehran, Iran, on Thursday, Aug. 30, 2012. (AP Photo/Office of the Supreme Leader)

  • In this photo released by the official website of the Iranian presidency office, Egyptian President Mohammed Morsi, left, talks with Iranian officials during opening session of Non-Aligned Movement (NAM) summit, in Tehran, Iran, on Thursday, Aug. 30, 2012. (AP Photo/Presidency Office)

  • Ali Akbar Salehi

    Iranian Foreign Minister Ali Akbar Salehi delivers a speech to an expert-level meeting of the Non-Aligned Movement, NAM, in Tehran, Iran, on Sunday, Aug. 26, 2012. (AP Photo/Vahid Salemi)

  • Arab diplomats talk prior to the start of an expert-level meeting of the Non-Aligned Movement, NAM, in Tehran, Iran, on Sunday, Aug. 26, 2012. (AP Photo/Vahid Salemi)