Iran's Supreme National Security Council Secretary Mohsen Rezaei said on Sunday that the US response to Iran's seven conditions for reopening the Strait of Hormuz was inadequate.
Mr Rezaei was quoted by state media, according to Reuters. Gulf News reported that he posted the remarks on X late on Sunday.
He said the US had accepted some of the conditions, but that others remained unclear. Gulf News and the Indian news agency ANI reported that he did not specify which conditions the US had accepted.
According to Reuters, Mr Rezaei said Iran was "no longer in the process of responding to the Americans". He also said there would be "no return to the status quo ante", according to Gulf News.
Mr Rezaei said Iran had told the Americans that the Strait of Hormuz would not be opened to them, and that no negotiations would take place, until the conditions were met.
Iran presented the proposal during the UN General Assembly, according to Reuters and Gulf News. It said the strait could reopen, and normal maritime passage be restored, within seven days if the conditions were met.
The US replied through Qatari intermediaries, the reports said. Reuters said the White House did not immediately respond to its request for comment. No US description of its response had been reported.
Reuters used the word "insufficient" for Mr Rezaei's assessment, while Gulf News and ANI used "inadequate". ANI quoted him as saying the US had agreed to some of the conditions, "but we consider its response INADEQUATE".
According to Al Jazeera, as cited by ANI, the conditions include ending the US naval blockade and restrictions on Iranian oil sales.
ANI reported that Parliament Speaker Mohammad Bagher Ghalibaf said earlier in October that the strait would stay closed until the US met seven conditions based on a 14-point memorandum of understanding from June.
The US and Iran are in a conflict that has disrupted shipping through the Strait of Hormuz. Reuters reported that a ceasefire has collapsed.
ANI reported that Iran sent the seven conditions via Qatari mediators last month as a basis for starting negotiations to end the conflict. Reuters reported that late in September Tehran said it had received a US response to its latest proposal to revive the ceasefire.
