The BBC's Bethany Bell, in Vienna, has examined the IAEA's latest quarterly report on Iran's nuclear programme.
BBC: UN nuclear agency IAEA: Iran 'studying nuclear weapons'
And one Western official said Tehran was, for now, being "very careful" in its nuclear programme.
Six-nation talks in Beijing on North Korea's nuclear programme resumed after a nine-month hiatus.
At the top of Mrs Clinton's agenda here was North Korea's nuclear programme and Burma.
UN, EU and US sanctions targeting Iran's nuclear programme exempt trade in medicine for humanitarian reasons.
So, he said, Hitachi's decision was a "significant... vote of confidence in the UK nuclear programme".
Other issues expected on the summit agenda included global warming, security and Iran's nuclear programme.
Tensions between the two countries over North Korea's nuclear programme were beginning to ease.
The leaders also discussed the war in Afghanistan and Iran's nuclear programme during the phone call.
He is also pressing Israel not to try to destroy Iran's nuclear programme by bombing it.
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Mr Hague promised the UK would increase the pressure on Iran to negotiate over its nuclear programme.
Mr Etemad has been back to Iran since but has not got involved in the nuclear programme.
Mr Vanunu spent 18 years in jail for revealing the existence of the clandestine Israeli nuclear programme.
Mr Peres dismissed as "nonsense" speculation that Israel was planning to attack Iran over its nuclear programme.
The EU last month banned all oil imports from Iran amid growing concern over Tehran's nuclear programme.
The bigger concern with Iran is how to tackle its nuclear programme, the source of long-term tension.
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North Korea said it was prepared to rejoin the six-party talks aimed at ending its nuclear programme.
But can it be soon enough to ease growing anxiety over Iran's nuclear programme and stave off more crippling sanctions?
Against apartheid in South Africa and an embryonic nuclear programme in Libya, they seem to have encouraged change.
Earlier, Mr el-Baradei said the investigation into claims about Syria's alleged nuclear programme had so far proved inconclusive.
Shortly afterwards the vote on sanctions against Iran over its nuclear programme set another test for Vietnam's diplomacy.
The US and the European Union have just tightened sanctions on Iran over concerns about its nuclear programme.
President Obama even made a light-hearted reference to Mr Netanyahu's warning of a "red line" with Iran's nuclear programme.
Addressing Iran, Mr Obama said there was still time to resolve the impasse over its nuclear programme through diplomacy.
When it comes to Iran's nuclear programme, however, outside worries are more warranted.
Iran is under increasing pressure from the international community over its nuclear programme.
Iran denies it is seeking to develop nuclear weapons and insists its nuclear programme is solely for peaceful purposes.
Our correspondent says Mr Netanyahu came to Washington with his own list of priorities, topped by Iran's nuclear programme.
The US has already slapped sanctions on dozens of Iranian government agencies, officials and businesses over the nuclear programme.
Saudi Arabia and Libya were long thought to have financed Pakistan's nuclear programme.
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