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Ahmadinejad will address the the United Nations Nuclear Non-Proliferation Treaty review conference in New York on Monday, spokesman Ramin Mehmanparast told Iran's News Network.

Ahmadinejad told reporters in Tehran before his departure that the NPT has failed.

"The biggest threat to the world today is the production and stockpiling of nuclear weapons," he said.

Ahmadinejad began his trip a day after saying he has proof that the United States and Israel are linked to the world's leading terrorist organizations, according to state-run media.

"We have documents that prove [Washington] is the root of world terrorism," Ahmadinejad said in a speech in Tehran, Press TV reported. "It has been aiding and abetting extremist groups over the past years."

The United States "is the only country to have used the atomic bomb in military conflict," Ahmadinejad said Saturday, according to Press TV. "They even admit themselves that they resorted to using [similar weapons] during the war they waged on Iraq."
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