The Institute of Applied Physics (API) is affiliated with the Iranian military and suspected of involvement in possible nuclear weaponization efforts. [1] Specifically, the IAEA discussed with Iran the participation of an IAP staff member in work on exploding-bridge wire detonators and an attempt to purchase radiation-monitoring equipment from abroad. [2] Iran declared that the staff member in question was in fact working on a project for the country's oil industry. The Agency also mentions the API in connection with a series of other undeclared nuclear activities. [3] As of November 2010, the issue remains unresolved.

Sources:
[1] "Nuclear Sites, Weaponization-Related R&D," Institute for Science and International Security, www.isisnucleariran.org.
[2] "Implementation of the NPT Safeguards Agreement in the Islamic Republic of Iran," International Atomic Energy Agency (IAEA), 26 May 2008, www.iaea.org.
[3] According to the IAEA: "training courses on neutron calculations, the effect of shock waves on metal, enrichment/isotope separation and ballistic missiles. Efforts to procure spark gaps, shock wave software, neutron sources, special steel parts and radiation measurement equipment, including borehole gamma spectrometers...." "Implementation of the NPT Safeguards Agreement in the Islamic Republic of Iran," International Atomic Energy Agency (IAEA), 23 November 2010, www.iaea.org.