The FFM's conclusion is based on a wide range of information, including the results of analysis of biomedical samples taken from the victims and the surrounding environment, and extensive witness interviews.
A joint United Nations and OPCW investigation, known as the JIM, can now look at the incident to determine who is to blame, she said.
Two influential Tory MPs signalled they would support military strikes against Assad's bases in response to another chemical weapons atrocity. It said the Syrian government was prepared to cooperate with the investigators.
The Syrian government was accused of using chlorine gas on Saturday against the Failaq al-Rahman rebel group in Ain Tarma in the Eastern Ghouta region in the Damascus countryside causing 30 people to suffer from suffocation, as reported by Reuters.
"There is no moral, legal or political justification of the illegal United States strikes on Syria, however, we have to take into account that insane ones are capable of doing anything", said Mekdad, adding the main goal of the U.S. attacks on Syria was to prevent the Syrian Army from achieving its victory against the threat of terrorism, stressing that Washington and its lapdogs made huge "investments" in terrorism and deliberately attacked Syria only to hold back the progress of its army.
Investigation by worldwide chemical weapons monitor concludes sarin or sarin-like substance used in April 4 attack.
Fall in United Kingdom shop prices eases, food soars - BRC
These pressures arise both from market driven increases in the underlying cost of goods and as a result of government policies. Last month the BoE said consumer price inflation, which stood at 2.9 percent in May, could exceed 3 percent by the autumn.
In a confidential report on Thursday, an OPCW fact-finding mission concluded that sarin was used as a chemical weapon in the April 4 attack.
"The report comes up with a fabricated and exaggerated story that has no credibility and can't be accepted in any way because it is illogical and is the creation of a sick mind", the regime foreign ministry said.
The military adamantly denied the claims in a statement via state-run media. Western intelligence agencies had also blamed the Assad government.
More than 90 people had been killed in the April 4 attack on Khan Sheikhoun in Syria's Idlib province.
The OPCW-UN joint investigative mechanism (JIM) has already determined that Syrian regime forces were responsible for chlorine attacks on three villages in 2014 and 2015, and that Daesh used mustard gas in 2015.
"The reactions of Syria and its allies will not be as it was before and this is what we said and what the military and political leadership in Russian Federation also said", Mekdad said.