Russian Plane Crash: Waiting for That 0.1%

More than a week after the flight from Sharm el-Sheikh to St. Petersburg exploded in the air, killing all 224 on board, there is a growing consensus by U.S. and British officials that the Russian Metrojet Airbus A321 was downed by a bomb placed by affiliates of ISIS. One intelligence official said it was "99.9% certain" that a bomb downed the plane.

Adam Schiff, the leading Democrat on the House Intelligence Committee, had a similar just-about-there statement Saturday: "I think there's a growing body of intelligence and evidence that this was a bomb — still not conclusive — but a growing body of evidence."

Why the reluctance to go that final 0.1%?...

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