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PBS News Hour
What we know so far about the Metrojet mystery
What downed a Russian airliner and killed 224 people on its path from Sharm el-Sheikh to St. Petersburg? The cause remains far from clear. Gwen Ifill speaks to Alan Diehl, a former National Transportation Safety Board investigator and author of "Air Safety Investigators: Using Science to Save Lives -- One Crash at a Time."
