Fred Harteis News Articles - Iran's alleged research into designing nuclear warheads remains a matter of serious concern and needs "substantive explanations", the U.N. nuclear watchdog said on Monday.

 

The International Atomic Energy Agency (IAEA) also said in its latest report on Iran that Tehran had 3,500 uranium enrichment centrifuges working at its Natanz underground nuclear facility, a slightly higher number than earlier this year.

 

The agency said it had not been given access to Iranian nuclear-related sites that it asked to see in April.

 

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