The Iranian capital Tehran is at the best of times - one of the most polluted cities on earth.

即使在环境状况最好的时候，伊朗首都德黑兰仍然是世界上污染程度最严重的城市之一。

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These quibbles aside, the Tehran Times was confident that the election result would testify to the "political vigilance and maturity of the Iranian people".

BBC: Iranian press hails expected high turnout

The letter is said to mention a model of centrifuge, called IR2m, which can enrich two or three times faster than the present equipment being used by Tehran, according to the Associated Press.

BBC: Natanz uranium enrichment plant

The letter is said to mention a model of centrifuge, called IR2m, which can enrich two or three times faster than the present equipment being used by Tehran, according to the Associated Press news agency.

BBC: Natanz uranium enrichment plant