The National Council of Resistance of Iran (NCRI), an exiled Iranian opposition group, stated that Iran is moving a nuclear weaponization research center called "SPND" to a defense ministry complex about 1 mile away from its current location. The NCRI claims that about 100 researchers and engineers work at the center, which allegedly conducts small-scale experiments with radioactive materials. According to the NCRI, Iran is moving the center in order to avoid a visit by U.N. inspectors.