The missing material, Iridium-192, was reported to the International Atomic Energy Agency by Iran's nuclear regulatory body earlier this month, who warned neighboring Gulf States of its possible nefarious use.
A so-called dirty bomb, or radiological dispersion device, is a conventional weapon equipped with nuclear material. The idea behind a dirty bomb is to blast radioactive material, such as powder or pellets, into the area around an explosion.
Citing Saudi intelligence sources, Asharq al-Awsat reported Friday that the Iridium-192 was stolen as it was being transported from the Bushehr facility. The vehicle carrying the nuclear material was later found abandoned with its contents seized.