President Donald Trump vowed retaliation for the killing of two U.S. Army soldiers and an American civilian interpreter in Syria on Saturday. U.S. officials told PBS News that the shooter had ties to ISIS and had infiltrated Syrian security forces. The Pentagon said the two soldiers and the interpreter were ambushed by a lone gunman in the city of Palmyra while taking part in ongoing counterterrorism missions. The gunman, who was already under investigation for his ties to ISIS, was killed, acco

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