“It was the first time that we were able to confirm 100 percent that an attack took place”, he said in a phone call.
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The British-based group said bombardments by both sides have killed more than 120 people in the city since the start of August.
Russian Federation was meanwhile offered the possibility of joint operations against IS by Turkey, which has backed rebel groups against President Bashar al-Assad.
The offer by Turkish Foreign Minister Mevlut Cavusoglu to coordinate with Russia on operations against IS followed a meeting between the Russian and Turkish leaders earlier this week in which they agreed to mend ties.
As the fighting between Syrian rebel forces and Assad’s military continues, sources from within the country are reporting that risky chemical weapons have been used over the past few days in Aleppo.
ITV News has documented the battle with many observers expressing fears of a humanitarian crisis with thousands trapped inside the city with scarce resources.
During yesterday’s briefing, United Nations officials also criticised Russia’s proposed ceasefire of three hours a day, calling for a break of up to 48 hours instead.
“There is a lot of evidence that it actually did take place”, U.N. Special Envoy for Syria Staffan de Mistura told reporters, adding that the attack would amount to a war crime if confirmed.
“We can deliver these within 24-48 hours – if we have safe access”, Mr O’Brien said.
But rebels and regime forces clashed in southern Aleppo today, including during the period when the pause was meant to take hold, said the Syrian Observatory for Human Rights.
Fighting has escalated in Aleppo in recent days, with rebels severing the government’s main route to the west of the city.
Air strikes killed at least 19 people and wounded dozens in rebel-held Idlib province, southwest of Aleppo, on Wednesday.
Meanwhile, a Syrian military official has denied allegations of a chlorine gas attack against an opposition-held district in Aleppo. He said the first blast released a gas he identified by the smell as chlorine, but the wind was blowing in the other direction, lessening the odour.
In a letter addressed to President Obama, 15 physicians left in the bombed-out eastern areas of the city called Thursday for help in getting humanitarian aid to 300,000 civilians trapped there and ending punishing air raids by warplanes operated by Syria’s government and Russian Federation.
“With heavy bombing continuing relentlessly in Aleppo especially, hospitals and clinics need to be treated as the sacred life-saving places they are, not as additional bombing targets”, said deputy Middle East director Nadim Houry.
The letter from the doctors ends with a plea for help: “We do not need tears or sympathy or even prayers, we need your action”.
Mr Johnson said: “While the siege has been broken, the Assad regime and Russian Federation continue to bombard parts of the city and I am particularly concerned by reports of chlorine gas attacks which if proven, would be utterly abhorrent”. It says the raid destroyed a large ammunition depot, a plant producing chemical weapons northwest of the city and a large IS training camp. “Prove that you are the friend of Syrians”, they wrote.
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De Mistura also said that senior military officials from Russian Federation and the United States are still working on restoring an overall ceasefire after five years of civil war that has killed a quarter of a million people and displaced 11 million.
