Just days before his planned trip to New York, Iranian President Mahmoud Ahmadinejad said he has proof that the United States and Israel are linked to the world's leading terrorist organizations. According to state-run media, Ahmadinejad said in a speech in Tehran, we have documents that prove Washington is the root of world terrorism. It has been aiding and abetting extremist groups over the past years. His remarks came as the United States pushes for new international sanctions against Iran over its refusal to halt its nuclear program. Ahmadinejad plans to attend a United Nations summit on the Nuclear Non-Proliferation Treaty, which opens tomorrow. <br/>