WASHINGTON -- Iranian President Mahmoud Ahmadinejad says that as an engineer he's sure the twin towers were not brought down by jetliners.

Ahmadinejad, in an interview with The Associated Press, says it would have been impossible for two jetliners to bring down the towers simply by hitting them. he says some kind of planned explosion must have taken place.

Ahmadinejad stopped short of saying the United States staged the disaster 10 years ago. But he says there are questions the world should resolve, and noted there are doubters in the United States as well.

Ahmadinejad was denied his request last year to visit the site of the World Trade Center collapse. He says he's not making another attempt this year. He's in New York City for the U.N. General Assembly.

Sources:

http://www.huffingtonpost.com/2011/09/22/ahmadinejad-twin-towers-c_n_977039.html

http://www.cbsnews.com/stories/2011/09/22/ap/business/main20110455.shtml

http://www.npr.org/templates/story/story.php?storyId=140724738

http://ca.news.yahoo.com/ap-interview-iranian-president-says-co-ordinated-explosion-003525307.html