The investigation into the deadly strike on an Iranian elementary school has revealed that old intelligence indicated the school was a military target, according to four sources. The Defense Intelligence Agency was one of the agencies responsible for providing the targeting information, though other sources likely contributed to verifying the target. President Donald Trump has previously denied the U.S. was behind the strike and suggested that Iran or other countries may be responsible. The United Nations has warned that an attack on a functioning school during class hours could constitute war crimes.