Syria tested firing systems for poison gas shells at the country's largest chemical weapons research center at Safira, east of Aleppo, last month, German weekly Der Spiegel reported on Monday, citing statements from various witnesses.
According to the report, Iranian Revolutionary Guard officers were flown in by helicopter to witness the testing.
According to the report, Syria has reinforced security at the facility and made efforts to safeguard its electricity supply in recent months, in case of rebel attack.
Both the US and Israel have expressed concern over Syria's stockpile of chemical weapons falling into the wrong hands or being used by Syrian President Bashar Assad to quell the uprising in the country.
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