U.S. military investigators believe that it’s likely the United States was responsible for the deadly strike that killed more than 175 people, including dozens of children, at a girls’ school in Iran.Two U.S. officials told Reuters Thursday that the horrific attack at Shajarah Tayyebeh over the weekend was most likely the work of the U.S. military, but they noted that the investigation was still ongoing and did not rule out discovering evidence that could point the blame elsewhere. The strike on...