Apr 30, 2013 — An international team of doctors is helping Syrian health workers recognize the signs of a chemical attack. They're also teaching them how to collect and preserve tissues as potential evidence if war crimes charges are brought.
May 5, 2013 — Israeli warplanes attacked a military research center near Damascus early Sunday, according to intelligence reports and Syrian state media. Israel has offered no comment on the raid, which came days after a similar strike that reportedly targeted missiles intended for Hezbollah militants in Lebanon.
May 4, 2013 — Israel has conducted an airstrike against a target in Syria, in an apparent attempt to keep a shipment of missiles from reaching Hezbollah, according to multiple news agencies citing Israeli and U.S. officials. Israel has not officially confirmed the attack, which reportedly came early Friday.
Mar 21, 2013 — The United States has declared the use of chemical weapons is a "red line" in the conflict. U.N. Secretary-General Ban Ki-moon said their se is a "crime against humanity."
Mar 19, 2013 — State-controlled media say rebels used the weapons in Aleppo. Opposition forces say the Assad regime is responsible. Neither the report of such weapons being used nor who might be responsible have been confirmed. The White House says it has no evidence the weapons were used.
Dec 11, 2012 — The major general who was head of Syria's chemical weapons division until he defected in July says that if rebels advance on Damascus, President Bashar Assad will deploy his deadly arsenal.
Aug 11, 2012 — Secretary of State Hillary Clinton and Turkey's foreign minister announce the creation of a working group to deal with the collapse of Syria, and the potential of a chemical weapons attack by the Syrian government.
Jul 23, 2012 — By threatening instead to use its chemical or biological weapons against "external aggression," the Assad regime is going up against customary international humanitarian law.