Forces loyal to Syria's President Bashar al-Assad take up position with their weapons in Sheikh Saeed on the Airport Road near Aleppo city April 13, 2013. The forces began military operations towards Sheikh Saeed to pave the way for their troops to enter. REUTERS/George Ourfalian (SYRIA - Tags: CONFLICT MILITARY POLITICS CIVIL UNREST) - RTXYKF6


� George Ourfalian / Reuters

A senior Israeli military official has said Syrian forces have used chemical weapons against rebels several times. Brigadier General Itai Brun said military intelligence believed the nerve agent sarin had probably been used "in a number of incidents." The Obama administration has said it would not tolerate the use of chemical weapons in Syria.

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