Two inspectors from the International Atomic Energy Agency (IAEA) have arrived in Iran to inspect the nuclear enrichment facility at the country's Natanz site.
Quoting an unnamed diplomat, IRNA reported that the inspectors arrived in Tehran on Tuesday evening.
The diplomat told IRNA that the visit was normal and the team was scheduled to stay in Iran for a week.
However, the visit came a day after Iranian President Mahmoud Ahmadinejad declared that Iran has started uranium enrichment at an industrial level.
Head of Iran's Atomic Energy Organisation Gholamreza Aghazadeh had said on Tuesday that Iran is planning to install 50,000 centrifuges.
Iranian parliament last month demanded the government should limit its cooperation with IAEA after UN Security Council slapped a ban on Iran, demanding a halt in Iranian nuclear activities.
The IAEA inspectors continue to pay regular visits to Iranian nuclear sites.