Sarin Gas was used in Syria attack: United States report to UN

Akkam has accused the rebels in the town of Khan Sheikhoun, where the April 4 attack occurred and killed more than 90 people, of carrying out the attack.

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.

"We should ask how they got to these results", Akkam says.

An OPCW investigating team was deployed within 24 hours of the attack on April 4, though for security reasons they could not visit its site in Khan Sheikhoun, in the northern Idlib region.

The joint United Nations and OPCW investigating mechanism was established after a Security Council resolution was passed in August 2015 to identify the individuals, entities, groups and governments that use, organise or promote the use of chemical weapons in Syria.

The United States and its allies have accused the Moscow-backed Syrian regime of being behind the attack, a claim Russian Federation rejects.

The findings were not a surprise as Turkey and the United States had said that the victims showed symptoms consistent with Sarin gas, and the Trump administration responded to the attack with the launching of missiles aimed at Syrian targets.

Syrian President Bashar Assad denied responsibility for the attack.

Sarin was used in Syria attack, chemical weapons watchdog says

Moscow has rejected the suggestion that its ally Assad was behind the strike, saying the Syrian government has gotten rid of all chemical weapons. "They don't know how the sarin ended up there, yet tensions have been escalating for all these months".

British Foreign Secretary Boris Johnson is urging the worldwide community to work together to bring to justice those responsible for a deadly April 4 nerve gas attack in Syria.

The Organization for the Prohibition of Chemical Weapons confirmed the findings of the investigation in a statement Friday.

While the OPCW report did not apportion blame, Johnson says that "the U.K.'s own assessment is that the Assad regime nearly certainly carried out this abominable attack".

Russian Federation today dismissed a report by the UN's chemical weapons watchdog that sarin was used as a chemical weapon in a April 4 attack in the Syrian town of Khan Sheikhun. "The perpetrators of this horrific attack must be held accountable for their crimes".

British Foreign Secretary Boris Johnson said that while the report did not apportion blame, "the U.K.'s own assessment is that the Assad regime nearly certainly carried out this abominable attack".

The French foreign ministry said Friday in a statement that the OPCW report "concludes without doubt that sarin".

The OPCW said its mandate was exclusively to determine whether chemical weapons were used in the attack which killed more than 100 people.