BEIRUT (Reuters) - The party of Lebanese Prime Minister Saad al-Hariri, who unexpectedly quit a week ago while in Saudi Arabia, denounced on Saturday attacks against the kingdom and Iranian intervention in Arab countries. Hariri s Future Movement political party said it stands by him and was  waiting impatiently for his return to Lebanon to handle his national responsibilities in leading this stage.  Hariri s shock resignation, in a broadcast from Riyadh last week, has plunged Lebanon into crisis and thrust it back into the forefront of regional rivalry between Iran and Saudi Arabia. 