Washington: Senior officials from world powers held a conference call on Monday to discuss Iran's response to a package of incentives to curb its nuclear activities, said the US State Department.

State Department spokesman Sean McCormack said political directors from the five permanent members of the UN Security Council spoke via telephone on Monday.

"We are consulting with our partners on issues related to that response and what we might hear and what we have heard thus far," he told reporters of the conference call.

The major powers offered Iran a revised package of incentives last month and said Tehran must suspend its uranium enrichment work before formal talks could start on the package, which includes help to develop a civilian nuclear program.


So far the Iranian government's formal response to the latest offer has not been made public and there have been mixed signals in statements by its senior officials.

"There is clearly a debate, or at least a discussion, within the Iranian government on how to respond," said McCormack.

Iranian President Mahmoud Ahmadinejad said on Monday his country would not stop enriching uranium and rejected as "illegitimate" a demand by major powers that it do so.