Earlier on Thursday, more than 100 fighters aligned with Syrian President Bashar Assad were killed after US -led coalition and coalition-backed local forces thwarted a large, apparently coordinated attack.
But Turkey's military said on Friday that its fighter jets bombed 19 targets belonging to "terrorists", including shelters, ammunition depots and gun positions, according to the AP. The U.N.is now investigating the most recent attacks, though Russian Federation blocked a statement originating in the Security Council condemning Assad's use of the forbidden weapons.
Heather Nauert, a spokeswoman for the State Department, said the U.S.is "extremely concerned" about escalating violence in rebel-held areas in the northwestern province of Idlib and in Eastern Ghouta, near Damascus.
The Syrian government denies using chemical weapons.
State Department spokeswoman Heather Nauert said on Thursday that the U.S.is supporting a United Nations call for a month-long "cessation of violence", with the goal of allowing humanitarian aid and medical care to flow to more than 700 civilians in the besieged suburbs, according to the Associated Press.
Sweden and Kuwait requested the meeting of the top United Nations body on Wednesday as Syrian government forces continued to shell rebel-held Eastern Ghouta, killing scores in some of the worst bloodshed in years. This is a key point people should know: "there is no safe space", Siraj Mahmoud, the head of the Civil Defence rescue service in opposition-held rural Damascus, told Reuters.
Instead, the air campaign appears focused on residential buildings and hospitals.
Meanwhile, in eastern Syria, the regime is accusing the US of "aggression" after the Syrian government and the USA -led coalition exchanged direct attacks in Deir el-Zour province.
But as the last rebel-held district on the capital's doorstep, the government is more determined than ever to clear it, said Nick Heras, an analyst at the Center for New American Security.
The overnight attacks came after a lull in Turkish air strikes following the shooting down of a Russian warplane elsewhere in Syria last weekend.
Deadly battle with Syrian regime forces complicates Trump's Syria strategy
Still, the incident underscored growing tensions in Syria amid reports of Syrian chemical weapons use elsewhere in the country. However, the United States has made it clear that it does not intend to leave the area.
Citing a police source, SANA said the shells were launched from Eastern Ghouta.
Syrian regime forces have been carrying out intensified airstrikes on both areas in recent days, killing dozens of civilians and injuring hundreds more.
At the time, in June 2017, French President Emmanuel Macron vowed to support the U.S.in any future attacks on the Syrian government in response to alleged chemical attacks. According to the Syrian Observatory for Human Rights, 34 people died in the area on Wednesday.
Idlib and Eastern Ghouta are two of four "de-escalation zones" which had been agreed upon by both sides of the conflict at peace talks in Kazakhstan previous year.
The ongoing fighting and deliberate obstructions by forces were preventing aid organisations from reaching civilians, it said.
The monitor said government air strikes had killed more than 230 people in the last four days.
Hassan, the Syrian analyst, said the boycott was a major blow for the Russians. Rescue teams rushed to the district and pulled three children and a woman out of the rubble.
Turkish President Recep Tayyip Erdogan ramped up his verbal assault on the USA role in Syria on Tuesday, saying U.S. forces should leave Manbij, a Syrian city held by YPG-allied forces with support from a US-led anti-Islamic State coalition.
The Turkish army, which launched an air and ground offensive into the Afrin region on January 20, said it had conducted further air strikes on Kurdish fighters there.