Iran has further increased its stockpile of uranium enriched to near weapons-grade levels, a confidential report by the UN nuclear watchdog said Saturday and called on Tehran to urgently change course and comply with the agency’s probe.

FM threatens response to 'any inappropriate action' by UK, France, Germany as trio mulls steps after reports show secret nuclear activity and increased uranium enrichment

In a separate confidential report circulated among member states and cited by multiple media outlets, the IAEA claimed that Iran had engaged in undeclared nuclear activities at three sites long under investigation, involving nuclear material that had not previously been disclosed to the UN agency.

"Despite countless warnings by the international community, Iran is totally determined to complete its nuclear weapons program," the PMO said.