According to Reuters news agency, he did not specify what changes to the package Iran might seek but Tehran has always rejected the central crux of the proposal -- that it should give up enriching uranium. Without a concession on this, the deal will fail.

"We should study the package offered. We should classify it. There are points which are acceptable. There are points which are ambiguous and there are points that we believe should not exist," Foreign Ministry spokesman Hamid Reza Asefi said.

"We have received the package, we should give our views in response to that package and we will offer our proposals," he told a weekly news conference.

Although Asefi's remarks are a strong indication Iran is unhappy with the terms offered, the Foreign Ministry does not have the last word on nuclear issues.

Supreme Leader Ayatollah Ali Khamenei has entrusted nuclear matters to the Supreme National Security Council and appointed Ali Larijani as chief negotiator.

/www.reuters.com/