Special Report: Two U.S. soldiers and civilian interpreter killed in Syria

Two U.S. Army soldiers and an American civilian interpreter were killed in Syria, with President Donald Trump saying the U.S. will "retaliate" following the attack by a lone Islamic State group gunman. The attack happened in the city of Palmyra, where an American unit was taking part in a "key leader meeting." Three U.S. soldiers were also wounded in the attack.