Malaysia Airlines flight MH17 carrying 295 people crashed near the town of Torez in the Donetsk region of eastern Ukraine on Thursday.
According to a Facebook post from a top Ukrainian official, as it flew at about 10,000 meters (nearly 33,000 feet) on the way from Amsterdam to Malaysia.
CNN reported that a senior U.S. official said, a radar system saw a surface-to-air missile system turn on and track an aircraft right before the plane went down.
The senior U.S. official also said that a second system saw a heat signature at the time the airliner was hit.
The United States is analyzing the trajectory of the missile to try to learn where the attack came from.
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