Syria remains the top destination for Iranian arms shipments in violation of a UN Security Council ban on weapons exports by Tehran, according to a confidential report on Iran sanctions-busting. Iran, like Russia, is one of Syria's few allies as it presses ahead with a 14-month old assault on opposition forces determined to oust Syrian President Bashar Al-Assad. The new report, submitted by a panel of sanctions-monitoring experts to the Security Council's Iran sanctions committee, said the panel investigated three large illegal shipments of Iranian weapons over the past year. “Iran has continued to defy the international community through illegal arms shipments,” it stated. “Two of these cases involved (Syria), as were the majority of cases inspected by the Panel during its previous mandate, underscoring that Syria continues to be the central party to illicit Iranian arms transfers.” The third shipment involved rockets that Britain said last year were headed for Taliban fighters in Afghanistan. “The Panel recommends the designation (blacklisting) of two entities related to these interdictions,” it said. “The report also takes note of information concerning arms shipments by Iran to other destinations.” The kinds of arms that Iran was attempting to send to Syria before the shipments were seized by Turkish authorities included assault rifles, machine guns, explosives, detonators, 60mm and 120mm mortal shells and other items, the panel said. The most recent incident described in the report was an arms shipment discovered in a truck that Turkey seized on its border with Syria in February. Turkey announced last year that it was imposing an arms embargo on Syria. Diplomats said that the panel's draft report may be changed by the Security Council's Iran sanctions committee before it is submitted to the Council itself for consideration. It was unclear how long it would take the committee to pass the report to the Security Council. Last year's expert panel report on Iran was never made public because Russia blocked its publication. The report also discusses Iran's attempts to circumvent sanctions on its nuclear program but notes that the four rounds of punitive measures the 15-nation Security Council imposed on Iran between 2006 and 2010 are having an impact. “Sanctions are slowing Iran's procurement of some critical items required for its prohibited nuclear program,” it said. “At the same time prohibited activities continue, including uranium enrichment.” Among the items Iran has attempted to procure for its nuclear program, the panel said, were nuclear-grade graphite, high-strength aluminum, aluminum, powder, specialized alloys, maraging steel, carbon fiber, magnets, vacuum pumps, turbines, electrical switchboards and helium gas detectors. “The Panel identifies the acquisition of high-grade carbon fiber as one of a number of critical items Iran requires for the development of more advanced centrifuges,” the report said, adding that nations should be on alert for illicit attempts to acquire such items.