The US has plans in place to attack Iran if other measures fail to stop it developing nuclear weapons, Washington's envoy to Israel says.
Dan Shapiro said the US hoped diplomacy and sanctions would persuade Iran to alter its nuclear programme, but a military option was "ready".
US President Obama has previously said military action has not been ruled out.
The US and its allies say Iran is developing a nuclear bomb, an accusation Tehran denies.
Talks between Iran and six world powers are due to resume in Baghdad on 23 May.
Mr Shapiro made his comments to the Israel Bar Association on Tuesday, a recording of which was later obtained by the Associated Press news agency.
"It would be preferable to resolve this diplomatically through the use of pressure than to use military force," Mr Shapiro said.
"But that doesn't mean that option is not fully available. No
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