They were also presented with thousands of documents detailing, for example, the daily operation of uraniumenrichmentfacilities as well as the construction and dismantling of specific weapons.
But the same facilities that are used for peaceful enrichment can be used to enrich uranium for a bomb, and inspectors say they have not been able to fully gauge Iran's intentions.
The International Atomic Energy Agency dismantled 40 nuclear-research facilities before the U.N. inspectors left Iraq, including three uranium-enrichment sites.
The Iranians suspect America of being behind the recent sabotage of one of their main nuclear facilities, which led to a temporary halt in uranium-enrichment work, and have noted WikiLeaks' revelations concerning American lobbying against Iran at the very time, in 1999, when Mr Obama was proposing detente.