In this Tuesday April 4, 2017 file photo, Abdel Hameed Alyousef, 29, holds his twin babies who were killed during a suspected chemical weapons attack, in Khan Sheikhoun in the northern province of Idlib, Syria. Turkey's health minister, Recep Akdag said Tuesday, April 11, 2017, that test results conducted on victims of the chemical attack in Khan Sheikhoun confirm that sarin gas was used. Officials from the World Health Organization and the Organization for the Prohibition of Chemical Weapons participated in the autopsies.
In this Tuesday April 4, 2017 file photo, Abdel Hameed Alyousef, 29, holds his twin babies who were killed during a suspected chemical weapons attack, in Khan Sheikhoun in the northern province of Idlib, Syria. Turkey's health minister, Recep Akdag said Tuesday, April 11, 2017, that test results conducted on victims of the chemical attack in Khan Sheikhoun confirm that sarin gas was used. Officials from the World Health Organization and the Organization for the Prohibition of Chemical Weapons participated in the autopsies. Alaa Alyousef AP
In this Tuesday April 4, 2017 file photo, Abdel Hameed Alyousef, 29, holds his twin babies who were killed during a suspected chemical weapons attack, in Khan Sheikhoun in the northern province of Idlib, Syria. Turkey's health minister, Recep Akdag said Tuesday, April 11, 2017, that test results conducted on victims of the chemical attack in Khan Sheikhoun confirm that sarin gas was used. Officials from the World Health Organization and the Organization for the Prohibition of Chemical Weapons participated in the autopsies. Alaa Alyousef AP

Did Russia know of Syria chemical attack in advance? U.S. officials want to know

April 11, 2017 12:44 PM

UPDATED April 11, 2017 05:22 PM

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