OutFront tonight: signs of chemical warfare in Syria.
New evidence is emerging that President Bashar al-Assad's regime has started mixing chemicals to make the deadly sarin gas, which could indicate that the military is gearing up to use its massive stockpile of chemical weapons.
This means that Assad is on the edge of President Obama's so-called "red line" against Syria, as the administration has repeatedly named the use of chemical weapons as an event that would prompt U.S. intervention in the country's civil war. Speaking just hours ago, the President warned Assad that the "world is watching" and he "will be held accountable" if the weapons are deployed.
CNN's Pentagon Correspondent Barbara Starr is OutFront with more details.
CLICK THROUGH TO SEE ACCOMPANYING PANEL DISCUSSION FEATURING CNN CONTRIBUTOR AND FORMER C.I.A. OPERATIVE BOB BAER AND PETER BROOKES, FORMER DEPUTY ASSISTANT SECRETARY OF STATE UNDER PRESIDENT GEORGE W. BUSH, ON WHETHER IT IS TIME FOR THE U.S. TO INTERVENE