Diplomats say satellite images from show trucks and earth-moving vehicles at the Parchin military site.
IAEA Director General Yukiya Amano
The diplomats who spoke to the news agency are all nuclear experts accredited to the International Atomic Energy Agency.
Two of the diplomats told AP the crews at the Parchin military site may be trying to erase evidence of tests of a small experimental neutron device used to set off a nuclear explosion. A third diplomat could not confirm that, but said any attempt to trigger a so-called neutron initiator could only be in the context of trying to develop nuclear arms.
The diplomats also said they suspect attempts at sanitization, because some of the vehicles at the scene appeared to be haulage trucks and other equipment suited to carting off potentially contaminated soil from the site. More