Iran's supreme leader Ayatollah Ali Khamenei on Wednesday ruled out allowing nuclear inspectors to visit military sites or to question scientists, state media reported.

"We have already said that we will not allow any inspections of military sites by foreigners," the official IRNA news agency quoted him as saying.

"They also say that we must allow interviews with nuclear scientists. This is interrogation. I will not allow foreigners to come and talk to scientists who have advanced the science to this level," Khamenei said.