Timeline: Unrest in Syria

Published On: Dec 24 2013 03:19:21 AM CST   Updated On: Sep 23 2014 09:32:18 AM CDT

The U.S. and several Arab nations have begun airstrikes in Syria -- the latest chapter in a bloody civil war. Learn about the major events in the country's tumultuous uprising.

John Kerry
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Floyd Yarmuth/CNN

Sept. 1, 2013: Secretary of State John Kerry says blood and hair samples collected from Damascus by first responders and tested by the U.S. have tested positive for sarin. Kerry argued the evidence strengthens President Barack Obama's call for military strikes on Syria.

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