Diplomats say major technical problems led to a temporary shut-down in Iran of thousands of centrifuges enriching uranium.
The diplomats told The Associated Press on Monday they had no specifics of the problem that led Iran in recent months to briefly power down the machines.
But suspicions focused on the Stuxnet worm, the computer virus thought to be aimed at Iran’s nuclear program. Experts last week identified the worm as calibrated to destroy centrifuges by sending them spinning out of control.
Iran is under U.N. sanctions for refusing to freeze enrichment, which it says it needs to make reactor fuel. The process can be used to produce the fissile core of nuclar warheads.
The diplomats asked for anonymity because the information is privileged.