The U.S. delegation at the United Nations walked out Thursday as Iranian President Mahmoud Ahmadinejad delivered a fiery broadside against the United States and what he called its “slave masters and colonial masters.”

Ahmadinejad told the U.N. audience that the United States used “the mysterious September 11 incident” as a pretext for wars against Afghanistan and Iraq.

The Iranian president offered his criticism in the form of a series of questions, asking who had engaged in slavery, imposed colonialism, supported military regimes and triggered World War I, World War II, the Korean War and the Vietnam War.

“The answers are clear,” Ahmadinejad said.

“By using their imperialistic media network which is under the influence of colonialism they threaten anyone who questions the Holocaust and the September 11 event with sanctions and military actions,” he said.

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