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Iran talks 'to go beyond deadline' Iran nuclear talks 'to go beyond 30 June deadline' - US
(35 minutes later)
Iranian nuclear talks to go beyond Tuesday deadline, US official says, as Iran's foreign minister flies home Iranian nuclear talks are set to go on beyond Tuesday's formal deadline for a deal, a senior US official says.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. The admission came as Iran's Foreign Minister Mohammed Javad Zarif prepared to fly back to Tehran from Vienna, Austria, where talks are taking place.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. Observers said Mr Zarif probably needed to seek guidance over a stumbling block in negotiations - how much access Tehran will grant to nuclear monitors.
Seven countries are taking part in the talks.
The negotiations aim to see limits placed on Tehran's nuclear programme in exchange for international sanctions on Iran.
The so-called P5+1 - the US, UK, France, China and Russia plus Germany - want to limit Iran's sensitive nuclear activities to ensure that it could not build a nuclear weapon quickly.
The negotiators were a few days late agreeing a framework agreement, which was reached in early April, and it now appears likely that Tuesday's deadline for a comprehensive deal may also not be respected.
But the US official - who spoke on condition of anonymity - insisted there would be no long-term extension, tweeted the BBC's state department correspondent Barbara Plett.
As well as the details of the proposed UN monitoring regime on Tehran's activities, disagreements are also reported to exist over the timing of sanctions relief.
US negotiators are being closely watched by critics both at home and in Israel - including Israeli Prime Minister Benjamin Netanyahu, whose country is understood to have the Middle East's only nuclear arsenal.
On Sunday he decried "this bad agreement, which is becoming worse by the day".