The al-Qaeda has sharply criticised Iran's President over his suggestions that the United States government was behind the September 11 attacks and not the al-Qaeda, dismissing the comments as “ridiculous.”

During his trip to New York last week for the U.N. General Assembly, Mr. Ahmadinejad claimed in an interview with The Associated Press that explosive material and not planes brought down the World Trade Center. He stopped short of saying the United States staged the disaster, but said that as an engineer, he's sure New York's twin towers were not brought down by jetliners.

“A few airplanes without previous coordination known to the security forces and the intelligence community in the United States cannot become missiles and target the heart of the United States,” Mr. Ahmadinejad said.

In an article posted online on Wednesday in the terror network's English-language Internet magazine Inspire, al-Qaeda rejected the Iranian leader's suggestions.

“Why would Iran ascribe to such a ridiculous belief that stands in the face of all logic and evidence?” asked the article's author, Abu Suhail. He said Iran wanted to portray itself as a country that stands up to the U.S.

“For Iran, anti-Americanism is merely a game of politics. It is anti-American when its suits it and it is a collaborator with the U.S. when it suits it,” said Abu Suhail.

The al-Qaeda mainly embraces Sunni militants, and is bitterly hostile toward Shias, who make up the vast majority of Iran.

The late al-Qaeda leader, Osama bin Laden, in his many audio and video messages praised the attacks several times and in 2004 he publicly acknowledged al-Qaeda's involvement and two years later asserted his responsibility for the attacks in an audio message defending Zacarias Moussaoui, who was undergoing a trial for his participation in the attacks.

In the U.S., the National Institute of Standards and Technology conducted a probe that took six years to complete of the tower collapses; the last report found that fire caused the collapse of 7 World Trade Center, a skyscraper north of the twin towers.

In the collapses of the twin towers, the agency found that extreme heat from the jetliner crashes caused some steel beams to lose strength, causing further failures in the building until the entire structure succumbed.

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