Iran has cancelled the accreditation of an International Atomic Energy Agency (IAEA) inspector who was prevented from entering a nuclear facility last week.

Axar.az reports citing BBC.

It said the inspector triggered an alarm at the gate to the Natanz uranium enrichment plant, raising fears that she was carrying "suspicious material".

The US said she was briefly detained - an accusation Iran rejected.

It seems to be the first such incident since the IAEA began monitoring Iranian compliance with a 2015 nuclear deal.

The US also warned that Iran appeared to be "positioning itself to have the option of a rapid nuclear break-out" after it rolled back another commitment under the accord.

On Thursday, uranium enrichment resumed at the underground Fordo facility. Enriched uranium can be used to make reactor fuel but also nuclear weapons.