This is a breaking story on the news based on the airstrike that the U.S. took in Syria. When the story first broke a month ago the U.S. had said that a mosque that some believed was hit with a bomb along with the building holding al Qaeda members. The U.S. now admits that unintentionally it did hit a mosque and there may have been civilian casualties.
http://www.cnn.com/2017/05/04/politics/syria-mosque-march-strike-us-investigation/index.html