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How did it lead to the truck being the source of the explosives though? How did they time the explosion to the train's crossing so well?

Feels to me like attacking from the ocean would have a higher probability of success than trying to sneak a truck packed with explosives onto a bridge that (one assumes) the Russians are very watchful over.

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By being packed with explosives. The video of the inspection of the truck before it crossed the bridge shows a not very thorough inspection and it was not X-rayed.

Also the underside of the bridge is untact as far as burn mark go.

And in terms of timing, even if the driver was unaware (i.e. wasn't a voluntary suicide mission), all it would take is a radio detonator and someone watching from afar with a telescope, if not a drone.

Ah true, I had assumed that the inspection would be a lot more thorough given the propaganda significance of the bridge.

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