[16][17] The Syrian Institute for Justice released photographs showing fragments of American weapons at the site of the bombing, which British newspaper The Telegraph cited as evidence that the US was responsible for civilian casualties.

[19] Within a week of the attack, US Central Command began two internal investigations, one into whether civilians had been killed and another to find additional information about the type of building hit and its occupants.

[13] Forensic Architecture concluded that "[a]ll of this makes it unlikely that a meeting of senior al-Qaeda operatives would have been taking place at the time of the strike.

"[13] In a report released 18 April 2017, Human Right Watch stated that they had "not found evidence to support the allegation that members of al-Qaeda or any other armed group were meeting in the mosque."

[21] In September 2017, a report from the UN Commission of Inquiry on Syria said that three days before striking the mosque compound, the U.S. team knew about the target but did not do enough to verify it.

[3] The report noted that the United States Central Command investigation included interviews with dozens of people, none of whom were in al-Jinah at the time of the attack.

[3] The investigators said the U.S. had sought to limit collateral damage using ten bombs that produced minimal blast and fragmentation to hit the building, before following up with two missiles fired by a drone at people fleeing.