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Iranian women gather during a demonstration against the execution of prominent Shiite Muslim cleric Nimr al-Nimr (portrait) by Saudi authorities, at Imam Hossein Square in the capital Tehran on January 4, 2016. Tensions between Iran and its Sunni Arab neighbours reached new heights as Saudi Arabia and Gulf allies cut or downgraded diplomatic ties with Tehran in a row over the execution of a Shiite cleric. AFP PHOTO / ATTA KENARE / AFP / ATTA KENARE        (Photo credit should read ATTA KENARE/AFP/Getty Images)
Iranian women gather during a demonstration against the execution of prominent Shiite Muslim cleric Nimr al-Nimr (portrait) by Saudi authorities, at Imam Hossein Square in the capital Tehran on January 4, 2016. Tensions between Iran and its Sunni Arab neighbours reached new heights as Saudi Arabia and Gulf allies cut or downgraded diplomatic ties with Tehran in a row over the execution of a Shiite cleric. AFP PHOTO / ATTA KENARE / AFP / ATTA KENARE        (Photo credit should read ATTA KENARE/AFP/Getty Images)

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Jamal Khashoggi of Al Arab News tells Christiane Amanpour the Iran-Saudi rift marks the last straw that broke the back of "a very sour relationship."

Iran-Saudi spat a battle of 'fire and dynamite'

Jamal Khashoggi of Al Arab News tells Christiane Amanpour the Iran-Saudi rift marks the last straw that broke the back of "a very sour relationship."