US officials: Blood samples show nerve agent in Syria gas attack

WASHINGTON — The U.S. now has blood and urine samples from last Saturday's deadly attack in Syria that have tested positive for chemical weapons, according to two U.S. officials familiar with the intelligence.

The samples suggested the presence of both chlorine gas and an unnamed nerve agent, two officials said. Typically, such samples are obtained through hospitals and or collected by U.S. or foreign intelligence assets on the ground. The officials said they were "confident" in the intelligence, though not 100 percent sure.

The Assad regime is known to have stocks of the nerve agent sarin, and has previously used a mixture of chlorine and sarin in attacks, say U.S. officials.

Officials also said that the U.S. has compiled intelligence from the U.S. and other countries, including images, that indicate the Syrian government was behind the weekend attack.

Activists and aid groups say that dozens died in Saturday's airborne assault on Douma, the last rebel stronghold in eastern Ghouta, which has been subjected to intensive bombing by Syria's Russian-backed Assad regime.

Russia and Syria have denied any involvement in the alleged chemical attack.

RELATED: Fatal gas attack in Syria

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April 2018 Syria attack leaves dozens dead
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April 2018 Syria attack leaves dozens dead
DAMASCUS, SYRIA - APRIL 07: An affected Syrian child receives medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. (Photo by Halil el-Abdullah/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 07: An affected Syrian man receives medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. (Photo by Halil el-Abdullah/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 07: An affected Syrian kid waits to receive medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. (Photo by Halil el-Abdullah/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 07: Affected Syrian kids wait to receive medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. (Photo by Halil el-Abdullah/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 07: An affected Syrian man lies on a stretcher as he waits to get medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. (Photo by Halil el-Abdullah/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 07: Affected Syrian kids wait to receive medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. (Photo by Fadi Abdullah/Anadolu Agency/Getty Images)
IDLIB, SYRIA - APRIL 08: A man holds a photo of a victim baby as he and other demonstrators gather to protest against Assad regime forces' allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta, in Saraqib town of Idlib, Syria on April 08, 2018. (Photo by Mahmut Bekkur/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 07: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'SYRIAN CIVIL DEFENSE (WHITE HELMETS) / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Affected Syrian kids receive medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Douma town of Eastern Ghouta in Damascus, Syria on April 07, 2018. At least 78 civilians dead, including women and children, according to the initial findings. (Photo by WHITE HELMETS / HANDOUT/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 08: An affected Syrian kid receives medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 08, 2018. At least 78 civilians dead, including women and children, according to the initial findings. (Photo by Mouneb Taim/Anadolu Agency/Getty Images)
DAMASCUS, SYRIA - APRIL 08: An affected Syrian kid receives medical treatment after Assad regime forces allegedly conducted poisonous gas attack to Duma town of Eastern Ghouta in Damascus, Syria on April 08, 2018. At least 78 civilians dead, including women and children, according to the initial findings. (Photo by Mouneb Taim/Anadolu Agency/Getty Images)
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U.S. officials say the Assad regime has conducted multiple chlorine attacks on rebels during the past six months.

In April 2017, President Donald Trump ordered a missile strike on a Syrian airfield after victims of an Assad regime attack on civilians in Khan Sheikhoun tested positive for sarin. U.S. officials said the government used a mixture of chlorine and sarin to kill dozens of civilians.

The assessment about the nature of this April's chemical attack and its likely origin with the Assad regime will be presented to the president, said the official familiar with the intelligence. The president is weighing options for retaliation.

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