Iran is fully prepared to enrich uranium at any level and with any amount, in further defiance of US the country efforts to squeeze with sanctions and force it to renegotiate a 2015 nuclear deal with world powers.
In a news conference broadcast live said on Sunday, senior Iranian officials said Tehran would keep reducing its commitments every 60 days unless signatories of the pact moved to protect it from US sanctions.
"In a few hours the technical process will come to an end and the enrichment beyond 3.67% will begin," said Behrouz Kamalvandi, the spokesman for Iran's Atomic Energy Organisation.
"And tomorrow early in the morning, when the IAEA (UN nuclear watchdog) takes the sample we would have gone beyond 3.67%."
Under the pact, Iran can enrich uranium to 3.67% fissile material, well below the 20% it was reaching before the deal and the roughly 90% suitable for a nuclear weapon.
Kamalvandi said Iran would enrich uranium for use in fuelling its Bushehr power plant, to the level of 5%, confirming what Reuters reported on Saturday.