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FILE - In this April 4, 2017 file photo, victims of a suspected chemical weapons attack lie on the ground, in Khan Sheikhoun, in the northern province of Idlib, Syria. Syria's government and its ally Russia accused Washington, Thursday, June 29, 2017, of concocting a "provocation" in Syria, which would then be blamed on President Bashar Assad's government as alleged use of chemical weapons to justify an attack. In a statement carried by the official news agency, Syria's Foreign Ministry said it rejects U.S. allegations that Syria was preparing for a chemical weapons attack, describing such accusations as "misleading" and "completely baseless." (Alaa Alyousef via AP, File)
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OPCW probe: Sarin used in deadly April 5 attack in Syria

FILE - In this April 4, 2017 file photo, victims of a suspected chemical weapons attack lie on the ground, in Khan Sheikhoun, in the northern province of Idlib, Syria. Syria's government and its ally Russia accused Washington, Thursday, June 29, 2017, of concocting a "provocation" in Syria, which would then be blamed on President Bashar Assad's government as alleged use of chemical weapons to justify an attack. In a statement carried by the official news agency, Syria's Foreign Ministry said it rejects U.S. allegations that Syria was preparing for a chemical weapons attack, describing such accusations as "misleading" and "completely baseless." (Alaa Alyousef via AP, File)

THE HAGUE, Netherlands (AP) — An investigation by the international chemical weapons watchdog confirmed Friday that sarin nerve gas was used in a deadly April 4 attack on a Syrian town, the latest confirmation of chemical weapons use in Syria’s civil war.

The attack on Khan Sheikhoun in Syria’s Idlib province left more than 90 people dead, including women and children, and sparked outrage around the world as photos and video of the aftermath, including quivering children dying on camera, were widely broadcast.

“I strongly condemn this atrocity, which wholly contradicts the norms enshrined in the Chemical Weapons Convention,” Organization for the Prohibition of Chemical Weapons Director-General Ahmet Uzumcu said in a statement. “The perpetrators of this horrific attack must be held accountable for their crimes.”

The investigation did not apportion blame. Its findings will be used by a joint United Nations-OPCW investigation team to assess who was responsible.

The OPCW scheduled a meeting of its Executive Council July 5 to discuss the findings.

The U.S. State Department said in a statement issued Thursday night after the report was circulated to OPCW member states that “The facts reflect a despicable and highly dangerous record of chemical weapons use by the Assad regime.”

President Donald Trump cited images of the aftermath of the Khan Sheikhoun attack when he launched a punitive strike days later, firing cruise missiles on a Syrian government-controlled air base from where U.S. officials said the Syrian military had launched the chemical attack.

It was the first direct American assault on the Syrian government and Trump’s most dramatic military order since becoming president months before.

Syrian President Bashar Assad has denied using chemical weapons. His staunch ally, Russian President Vladimir Putin, said earlier this month that he believed the attack was “a provocation” staged “by people who wanted to blame him (Assad) for that.”

Russian Foreign Minister Sergey Lavrov said the report, which was not released in full, doesn’t back claims by the U.S. and its allies that the sarin was dropped from aircraft.

The report “said they were not sure that the sarin found there had been airdropped in bombs,” Lavrov said in Moscow. “They don’t know how the sarin ended up there, yet tensions have been escalating for all these months.”

Britain’s Foreign Secretary Boris Johnson said that while the report did not apportion blame, “the U.K.’s own assessment is that the Assad regime almost certainly carried out this abominable attack.”

Both the U.S. and the OPCW were at pains to defend the probe’s methodology. Investigators did not visit the scene of the attack, deeming it too dangerous, but analyzed samples from victims and survivors as well as interviewing witnesses.

“A rigorous methodology was employed for conducting an investigation of alleged use of chemical weapons that took into account corroboration between interviewee testimonies; open-source research, documents, and other records; and the characteristics of the samples including those provided by the Government of the Syrian Arab Republic,” the OPCW said in a statement.

The Syrian government joined the OPCW in 2013 after it was blamed for a deadly poison gas attack in a Damascus suburb. As it joined, Assad’s government declared some 1,300 tons of chemical weapons and precursor chemicals which were subsequently destroyed in an unprecedented international operation.

However, the organization still has unanswered questions about the completeness of Syria’s initial declaration, meaning that it has never conclusively been able to confirm that the country has no more chemical weapons.

The investigative team responsible for the report has previously concluded “with a high degree of confidence” that chlorine and sulphur mustard, commonly known as mustard gas, had been used as weapons in Syria.

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Associated Press writers Vladimir Isachenkov and Nataliya Vasilyeva in Moscow contributed.

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