Sept 12 (Reuters) - Iraq ordered the closure of the Shalamcheh border crossing between Iraq and Iran as a precautionary measure after the latest drone attacks on Saudi Arabia, two security sources told Reuters on Saturday.The sources said a wide-scale operation was underway to pursue perpetrators of the attack on Saudi Arabia.Riyadh said on Friday its vital East-West pipeline was attacked by drones that were launched from Iraq. (Reporting by Aref Mohammed in Basra; Writing by Menna Alaa El-Din; Editing by Chris Reese)

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