Timeline: A history of sarin

Published On: Dec 24 2013 04:01:00 AM CST   Updated On: Sep 16 2013 10:24:47 AM CDT

A United Nations report due out Monday is expected to say say the perpetrators of last month's chemical weapons attack in Syria had up to 350 liters of sarin gas Look back at the history of sarin, a man-made nerve agent.

April 25, 2013: Defense Secretary Chuck Hagel announces Syria used sarin
12 / 12
Jim Watson/Reuters

April 25, 2013 - Defense Secretary Chuck Hagel first declares that Syria has used sarin gas on a small scale, killing 150 people in the country.

Upload Photos / Videos