"We take that very seriously", he said, adding that Centcom had not received any direct reports of civilian casualties.
The US-led coalition has been bombing jihadist groups in war-torn Syria for several years, with hundreds of civilians unintentionally killed in the country and in neighbouring Iraq.
"We targeted an al-Qaeda gathering across the street from a mosque".
On Thursday the US government confirmed that it carried out an airstrike in Syria which, according to AFP, struck a mosque killing 46 civilians.
Waqqaf doesn't think that the relatives of the dead civilians will see any justice, saying that it's also a "common practice" that was seen in Yemen, Afghanistan and Pakistan, and the U.S. will attempt to get out of the incident "as clean as possible".
The Syrian government and Russian forces have been conducting strikes in the Idlib province and the US has recently also begun to launch attacks in the area.
Russian Foreign Ministry spokeswoman Maria Zakharova said fragments of ammunition with Latin markings were found in the debris at the scene, which made it possible to conclude that Hellfire missiles were being used.
According to reports, at least 42 Syrian civilians lost their lives when U.S. warplanes bombed a mosque full of worshipers on Thursday night during evening prayers in a village west of Aleppo.
United States has been accused of an aerial attack on a mosque during prayer time in the Syrian city of Aleppo which killed 58 people late on Thursday.
Senior U.S. military officials have called for increased talks between Washington and Moscow to "deconflict" operations and make sure there are no collisions between aircraft.
"This was one of the worst massacres committed in the area", al-Halaby said.
The observatory said it wasn't known which side launched the attack.
"Peace in Syria is a moral and political imperative both for the Syrian people and for the world - an imperative that can not wait", said Guterres.
Syrian military and Russian jets have also carried out numerous air strikes against targets in Idlib and western parts of Aleppo province, which are held by rebels seeking to oust President Bashar al-Assad.
An airstrike at a mosque in a rebel-held area of northern Syria on Thursday killed at least 35 people, first responders and activists said.
"This is a crime against humanity, this is a war crime", Kurtulmus told reporters in the northwestern province of Canakkale.
Nintendo Switch stocks have been replenished
Next month will bring Mario Kart 8 Deluxe , while Skyrim , FIFA , NBA 2K18 and Super Mario Odyssey set to arrive later this year. The US retailer has confirmed that they will have new units for sale which will be offered up through new bundles packages.