United Nations nuclear inspectors said they are seriously concerned about the status of Iran’s inventory of near-bomb-grade uranium, as the Islamic Republic continues to deny them access to sites bombed several months ago by the US and Israel.

The International Atomic Energy Agency reiterated it hasn’t been able to verify Iran’s fuel stockpile since mid-June, according to documents seen by Bloomberg. It’s the first IAEA report since the UN security council reimposed sanctions that demand Iran suspend enrichment activities.