Secretary of State John Kerry says samples collected from Syria prove chemical weapons were used in the country.
Kerry told CNN Sunday morning the samples taken after an alleged chemical weapons attack outside Damascus more than a week ago showed signs of deadly toxin.
"I can share with you today that 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 gave no indication the samples were related to those taken by the United Nations inspectors. Those results could take up to three weeks. President Obama Saturday called for Congress to authorize military action against the Syrian regime in response to the alleged chemical weapons attack.