U.S. Central Command has also opened a credibility assessment into an airstrike Monday night, March 20, that targeted a school building near Raqqa, ISIS's de facto capital inside Syria.

The activist group Syrian Observatory for Human Rights alleges that an airstrike on the school killed 33 civilians who had been seeking shelter from local fighting.

And, U.S. Central Command is conducting a full investigation and credibility assessment of an airstrike on March 16 in the village of al-Jinnah in northwestern Syria.

U.S. officials said that airstrike killed dozens of al-Qaeda militants who had gathered for a meeting in a building near a mosque across the street. They emphasized that the mosque was not struck and that the building was not affiliated with the mosque. However, locals said that dozens of worshipers were killed in the airstrike and that the targeted building was, in fact, a mosque.

A military spokesman confirmed that earlier this week Gen. Joseph Votel, the commander of U.S. Central Command, ordered a full investigation into the circumstances of the mission.

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