Administration officials said Friday that US intelligence detected activity at known Syrian chemical weapons sites before Wednesday's possible chemical weapons attack that killed at least 1,000 people, according to CBS News. It is now seen as possible preparation for the attack. US intelligence agencies now lean to the conclusion that Syria did use chemical weapons. DEBKAfile's military sources add: The gas shells were fired by the Syrian army’s elite 155th Brigade. They came from stores near Damascus controlled by the Syrian Air Force intelligence service which answers directly to President Bashar Assad.