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LONDON (Reuters) - The U.N. nuclear watchdog has askedIran to explain evidence suggesting the Islamic Republic's scientists have experimented with an advanced nuclear warhead design, the Guardian reported in its Friday edition.

The newspaper, citing what it describes as "previously unpublished documentation" from an International Atomic Energy Agency compiled /news/globalcoverage/iran" title="Full coverage of Iran">Iran

The IAEA said in September it has no proof Iran has or once had a covert atomic bomb program.

The Vienna-based IAEA was not immediately available for comment on Thursday.

Iran's
Foreign Ministry and the Atomic Energy Organization of Iran (AEOI) were also unavailable for comment when contacted by Reuters.

The IAEA statement in September followed reports from the Associated Press quoting what it called a classified IAEA document saying agency experts agreed Iran now had the means to build atomic bombs and was heading toward developing a missile system able to carry a nuclear warhead.