Iran has revealed the existence of a second uranium enrichment plant, the UN nuclear watchdog has confirmed, BBC reported.
Tehran made the announcement earlier this week in a letter to International Atomic Energy Agency (IAEA) chief Mohammed ElBaradei.
Iran has previously acknowledged it has one enrichment plant at Natanz, which IAEA inspectors are monitoring.
The US, UK and France are set to accuse Iran over the plant before Friday's G-20 talks, the New York Times reports.
They and other Western nations have long feared that Iran is planning to develop an atomic weapon.
Tehran has always insisted its programme is for peaceful means.
The IAEA has asked to immediately inspect the plant, Reuters news agency reports.
Iran is supposed to have stopped all enrichment under threat of sanctions from the UN Security Council.
News of the Iranian letter comes days before Iran is due to enter fresh talks over its controversial nuclear programme.
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