Iran will reply next week to a U.N.-drafted plan for it to cut a stockpile of nuclear fuel, Iranian state television quoted a senior official as saying on Friday.
"We will give our answer to Mr ElBaradei next week," it reported Ali Asghar Soltanieh, Iran's representative to the IAEA, as saying.
"Iran informed the Director General today that it is considering the proposal in depth and in a favourable light, but needs time until the middle of next week to provide a response," the International Atomic Energy Agency said in a statement.
It said IAEA chief Mohamed ElBaradei, who had set a deadline of Friday for responses, hoped that Iran's response "will equally be positive, since approval of this agreement will signal a new era of cooperation".
The plan is seen as crucial to start defusing a standoff between Iran and world powers over its contested nuclear ambitions, but Iranian officials challenged key provisions of the scheme earlier on Friday.