US retaliation will lead to regional war: Iran official

Iran fired 'more than a dozen' missiles at US forces in Iraq, says Pentagon. (AFP photo)

Any US retaliation to Iran's missile attacks on American targets in Iraq could lead to an all-out war in the Middle East, an adviser to Iranian President Hassan Rouhani tweeted on Wednesday.

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"Any adverse military action by the US will be met with an all-out war across the region. The Saudis, however, could take a different path - they could have total peace!" Hessameddin Ashena said in a statement on Twitter.

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Tehran and Riyadh have been involved in proxy wars across the region for decades, from Iraq to Syria and Yemen. Iran has repeatedly urged its regional rival Saudi Arabia to improve ties with Tehran.