It cited the Russian Ministry of Defense. The medics said none of the patients were hurt by chemicals.
The world must provide a "robust, united and steadfast response", he said. "Increasing tensions and the inability to reach a compromise in the establishment of an accountability mechanism threaten to lead to a full-blown military escalation".
The UN Security Council overwhelmingly rejected a Russian resolution calling for condemnation of "aggression" by the United States, United Kingdom and France against Syria today, a vote reflecting support for the allied air strikes on Syrian chemical sites.
Guterres also said a failure to hold someone accountable for the attack could encourage more.
US, British and French forces pounded Syria with more than 100 missiles early on Saturday in response to a poison gas attack that killed dozens of people last week, in the biggest intervention by Western powers against Syrian President Bashar al-Assad. France is reported to be one of the strongest backers of a possible strike which Russian Federation strongly opposes.
"Did a chemical weapons attack happen?" He criticised the U.S. and its allies for launching the strike without waiting for inspectors from the global chemical weapons watchdog to visit the area.
The Violations Documentation Center (VDC), which records alleged violations of worldwide law in Syria, said bodies were found with foam at the mouth, discoloured skin and burns to the eyes.
According to a statement of the French presidency, Macron calls for dialogue between France and Russian Federation to "continue and intensify" to bring peace and stability to Syria. "We continue to observe unsafe military preparations for an illegal act of force against a sovereign state", Russian Ambassador Vassily Nebenzia told the UN Security Council.
Trump himself appeared on Thursday to cast doubt on at least the timing of any USA -led military action, tweeting: "Never said when an attack on Syria would take place".
The U.S., France and Britain have been consulting about launching a military strike in Syria.
The ministry also pointed at previous use of chemicals by the rebels in fighting with Syrian government troops. Erdogan did not elaborate.
The United States and allies struck Syria Friday night and Russian Federation has promised that the attack will come with consequences.
Western powers are thought to be preparing for strikes but Russian Federation, a Syrian ally, opposes such action.
Inspectors from the Hague-based Organization for the Prohibition of Chemical Weapons (OPCW) travelled to Syria last week to inspect the site, but have yet to gain access to Douma, which is now under government control after the rebels withdrew.
The Russian ambassador said his country is being "threatened" and warned that "such actions will not be left without consequences". He was referring to the three countries' efforts to reduce violence in Syria. The Syrian government has denied the allegations. A Western official told CNN that it is not conclusive, but officials suspect the substance used in the attack was a mixture of chlorine, sarin and possibly other chemicals.
Relations between Russia and Britain were already on edge after Prime Minister Theresa May blamed Moscow for the March 4 nerve agent poisoning of former Russian spy Sergei Skripal and his daughter Yulia in the city of Salisbury. And she said President Donald Trump told her Saturday morning that if the Syrian regime uses poisonous gas again "the United States is locked and loaded" to strike again.
Lavrov spoke to reporters in Moscow on Friday.