Secretary of State John Kerry: Blood And Hair Samples From Eastern Damascus, Syria, Show Signs Of Sarin Gas

U.S. Secretary of State John Kerry arrives to speak about the ongoing situation in Syria at the State Department in Washington, August 30, 2013. REUTERS/Larry Downing

Kerry: Evidence Shows Syria Used Sarin Gas -- CNN

(CNN) -- Evidence shows the Syrian regime used sarin gas in an attack on its people, U.S. Secretary of State John Kerry said Sunday on CNN's "State of the Union."

"Blood and hair samples that have come to us through an appropriate chain of custody from east Damascus from first responders -- it has tested positive for signatures of sarin," Kerry said.

The evidence -- which was gathered independently of the United Nations -- strengthens President Barack Obama's call for military action, he said.

"Each day that goes by, this case is even stronger," Kerry said, calling it "an overwhelming case."

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More News On Secretary of State John Kerry's Remarks That Syria Used Sarin Gas

Kerry: U.S. Has Evidence Sarin Gas Was Used in Syria -- Time/AP
Sarin gas used in Syria attack, Kerry says -- Washington Post
Kerry says new evidence Syria used sarin gas -- USA Today
Kerry takes case for Syria strike to the public -- FOX News
John Kerry: US 'has evidence of Syrian sarin use' -- BBC
Kerry: Samples from Syria tested positive for Sarin -- NBC