WASHINGTON (AFP) - Australia said it used an anti-weapons of mass destruction law to block three shipments to Iran but calls for new sanctions against the Islamic state opened up a new int'l divide Thursday. Australian PM Kevin Rudd said his country had blocked three shipments of unidentified cargo to Iran invoking a rarely used Weapons of Mass Destruction Act. The Australian newspaper reported that one of the orders made in recent months blocked a shipment of pumps. If you look at the threat to regional and global peace which Iran poses in its current N-weapons programme, there is no alternative other than robust international action including in areas such as this, Rudd said.