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(CNN) – The United States has concluded the Malaysian airline was shot down, a senior U.S. official told CNN's Barbara Starr. One radar system saw a surface-to-air missile system turn on and track an aircraft right before the plane went down Thursday, according to the official. A second system saw a heat signature at the time the airliner was hit, the official said. The United States is analyzing the trajectory of the missile to try to learn where the attack came from.