Russian investigators are homing in on RDX, the main ingredient in C-4 and Semtex, as the explosive that triggered the near-simultaneous destruction of a Tu-154 and a Tu-134 over Russia on the night of Aug. 24. The materials are believed to have been carried into the cabin inside the clothing or carryon bags of two suicide bombers who detonated the RDX at altitude, killing all 89 passengers and crew on the two aircraft. For the US, this latest terrorist attack exposes a longstanding ...

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