Washington  - The UN nuclear watchdog believes Iran has enough information to be able to make a functioning atomic bomb, the New York Times reported online Saturday.

According to unnamed European officials who describe an International Atomic Energy Agency report to the newspaper, Iran has "sufficient information to be able to design and produce a workable implosion nuclear device."

The IAEA report, titled Possible Military Dimensions of Iran's Nuclear Programme, also says Tehran has done research and testing on fashioning the components of a weapon, including delivering a nuclear payload with its medium-range Shahab 3 missile systems.

The news report comes as Mohamed ElBaradei, the head of the International Atomic Energy Agency (IAEA), arrived on Saturday in Tehran for a two-day visit to discuss the newly-revealed second Iranian enrichment plant with Iran's atomic chief Ali-Akbar Salehi.

ElBaradei has been reluctant to release the report publicly because of questions about its completeness and reliability, the newspaper said.

While in Iran, ElBaradei is also to arrange a date for a first IAEA inspection of the site, which is located near the holy city of Qom, 130 kilometres south of the capital Tehran. Iran, the five permanent members of the UN Security Council - the US, Britain, France, Russia and China - plus Germany met Thursday in Geneva to discuss Tehran's nuclear programme.

Iran agreed in Geneva to grant the Vienna-based nuclear agency access to the site.

There are however no plans for ElBaradei himself to visit the site. It was also unclear whether he would meet Iranian President Mahmoud Ahmadinejad. (dpa)