UNITED NATIONS - Iran has been using civilian aircraft to fly military personnel and large quantities of weapons across Iraqi airspace to Syria to aid Syrian President Assad in his attempt to crush an 18-month uprising against his government, according to a Western intelligence report seen by Reuters.

Earlier this month, US officials said they were questioning Iraq about Iranian flights in Iraqi airspace suspected of ferrying arms to Assad, a staunch Iranian ally.

Iraq says it does not allow the passage of any weapons through its airspace. But an intelligence report obtained by Reuters says Iranian weapons have been flowing into Syria via Iraq in large quantities. Such transfers, the report says, are organized by the Islamic Revolutionary Guard Corps.

"This is part of a revised Iranian modus operandi that US officials have only recently addressed publicly, following previous statements to the contrary," said the report, a copy of which was provided by a UN diplomatic source.

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