Iran has begun enriching small amounts of uranium gas in order to make fissile material that is used in nuclear warheads, diplomats in the International Atomic Energy Agency (IAEA) said Wednesday in Vienna.

The IAEA diplomats said Iran is using ten advanced centrifuges in the Natanz nuclear installation to accomplish the technological feat.

A week ago, the diplomats said Iran was experimenting with the centrifuges without using nuclear material, but now they have reported that nuclear material has been placed in the centrifuges.