The Canadian stash gradually being shipped from Chalk River, Ont., contains hundreds of kilograms of highly enriched uranium — large enough to make several Hiroshima-sized nuclear bombs.

But even as the radioactive freight travels toward the U.S. border, the Canadian Nuclear Safety Commission has no plans to hold public hearings or disclose which communities lie along the delivery route.

The shipments themselves are protected by intense security protocol, which means specifics like routes, transportation method, quantities and schedules remain top secret.

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