The head of the global nuclear watchdog says there has been no further damage to Iran's Natanz uranium enrichment plant since Israel struck the country's nuclear sites on Friday.

The head of the International Atomic Energy Agency says there is a possibility of both radiological and chemical contamination within Iran’s main nuclear enrichment facility in Natanz.

What began with Israeli strikes on Iranian nuclear facilities and other targets has now spiraled into the world’s first full-scale example of what is a “threshold war”.