Iran has been experiencing significant technical problems with equipment in its uranium enrichment drive and temporarily shut down some of its centrifuge machines, Western diplomats said on Tuesday. One senior diplomat said Iran acted after suffering power fluctuations but that it was unclear to what extent the Stuxnet computer virus may have been to blame. Iran is using an old centrifuge model which has been dogged by breakdowns for years. Security experts have said the release of Stuxnet could have been a state-backed attack, possibly from Israel or another foe of Iran, to sabotage the Islamic Republic's nuclear programme.

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