Saudi Arabia's King Salman today accused Iran of exporting extremist Islamic movements to the world and vowed to eliminate the Islamic State group. <br/><br/>King Salman said in a speech to leaders including US President Donald Trump that the Iranian regime has been the spearhead of global terrorism since the "Ayatollah Ruhollah Khomeini revolution" in 1979. <br/><br/>He said Saudi Arabia did not know terrorism and extremism until the Khomeini revolution reared its head. '