NEW : U.S. military : Gunman who killed 2 U.S. troops , wounded 3 was Iraqi soldier . Iraqi officials say shooter was soldier-in-training who opened fire at a training facility . He said the U.S. military is studying whether American combat troops scheduled to withdraw from urban centers in Iraq by June 30 Shootings underscore the dangers for U.S. troops and Iraqi security forces in Mosul . Score: 6
NEW : U.S. military : Gunman who killed 2 U.S. troops , wounded 3 was Iraqi soldier . Iraqi officials say shooter was soldier-in-training who opened fire at a training facility . Shootings underscore the dangers for U.S. troops and Iraqi security forces in Mosul . Score: 6