Iran has revealed to the UN nuclear watchdog the existence of a second uranium enrichment plant, reports say.
Tehran made the announcement in a letter to International Atomic Energy Agency (IAEA) chief Mohammed ElBaradei, sources are quoted as saying.
Iran has previously acknowledged it has one enrichment plant at Natanz, which IAEA inspectors are monitoring.
If confirmed, the reports will stoke fears that Iran is closer than thought to building a nuclear bomb.
The Iranian authorities have always insisted their nuclear programme is for peaceful means.
But the US and other Western nations fear Tehran is planning to develop an atomic weapon.
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. read more
