A war plane crashing in flames in a mountainous area in northern Syria after it was shot down by Turkish fighter jets near the Turkish-Syrian border, is seen in this still image taken from video November 24, 2015 (Reuters)
The United States believes Russia's incursion into Turkish airspace on Tuesday likely lasted only a matter of seconds before Turkey shot down a Russian warplane, a U.S. official said, saying the assessment was based on preliminary indications.
The official, who spoke on condition of anonymity, said the United States was still investigating the incident.
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