President Donald Trump claimed not to know that the U.S. military determined that it was responsible for killing about 150 people in the accidental bombing of an Iranian girls' school."Day 11, and as you know, we're doing something that nobody ever thought was possible to do," Trump announced to reporters outside the White House on Wednesday. "Our military is the best, it's the most powerful in the world, and they're hitting them very hard.""A new report says that the military investigation has found that the United States struck the school in Iran," one reporter noted. "As Commander and Chief, do you take responsibility for that?""That is what?" Trump asked."The school in Iran. A new report says the military investigation has found it was the United States that struck the school," the reporter repeated. "I don't know about it," Trump replied dismissively.The president has previously blamed Iran for striking the school.