A secret State Department cable obtained by Foreign Policy's Josh Rogin says that chemical weapons have already been used against the Syrian people by its government — the "red line" that President Obama said would cause the U.S. to get involved.
The weapon allegedly used on December 23 in the city of Homs is reportedly Agent 15, a nerve agent also known as BZ. Effects include vomiting, respiratory problems, and a number of different nervous system symptoms.
Rogin's story links to some of the videos circulated by opposition activists, who say they show victims of the chemical weapons. The first video shows a rebel talking about the apparent chemical attack; the rest show people are gasping for air and in some cases vomiting.