Iran has again rejected calls to end its nuclear fuel cycle work, despite fresh European threats to bring United Nations sanctions.

A Foreign Ministry spokesman Sunday repeated Tehran's claim that its uranium conversion work is aimed at generating electricity rather than atomic weaponry. He said Iran will not yield to threats from Western governments.

Iran resumed uranium conversion at its plant in Isfahan last month, rejecting European incentives aimed at ending Tehran's nuclear activities.

Thursday, the European Union said it would ask the International Atomic Energy Agency to seek U.N. sanctions at an IAEA board meeting September 19 in Vienna.

On Friday, an IAEA report said Iran has failed to answer key questions about its work with uranium and plutonium - two key materials needed for an atomic bomb.

Some information for this report provided by AFP and AP.