TEHRAN (AFP) - President Mahmoud Ahmadinejad said Sunday that Middle East nations will expel the United States from the region with a kick in the butt, as he launched a vitriolic tirade against Irans arch-foes. They have such nerve to threaten us and say all options are on the table. May the undertaker take you, your tables... away as you have dragged the world in mud, the hardliner was quoted as saying. If you dont leave the region, you should know that soon the nations of the region will expel you with a kick in the butt, he said in some of his harshest anti-US comments in recent times. The Iranian leader went on to cast fresh doubts on the September 11, 2001 terror attacks on the United States. We have hundreds of unanswered questions about the Sept 11 incident to which they should respond, and we will not back down on this, Ahmadinejad said in a speech marking the start of a housing project outside Tehran. If they claim 3,000 people were killed on Sept 11, they (the perpetrators) should be identified and executed. We will even help in their arrest provided they present evidence, but will not accept whatever Bush and Obama say, he said referring to former US president George W Bush and his successor Barack Obama. Even the Americans themselves do not accept these claims, let alone other nations. Last month Ahmadinejad sparked outrage in the United States and around the world when he accused the US govt of involvement in the terror attacks in a speech before the UN General Assembly in New York. Obama slammed the remarks as hateful and offensive. On Sunday he branded Irans regional arch-foe Israel a savage dog unleashed in the region. Interior Minister Mostafa M Najjar meanwhile mocked the latest US sanctions imposed against eight Iranian officials including himself for alleged rights abuses during unrest after Ahmadinejad won re-election in mid-2009. On Wednesday, Obama ordered that any US assets held by the officials be frozen and that they be denied US visas.