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Dean wrote a confidential memorandum addressing "how we can use the available federal machinery to screw our political enemies."

Black-and-white photographs and films showed miners in hard hats and soiled uniforms as they stood smoking cigarettes, climbing into open rail cars and running machinery that scooped and loaded piles of rocks.

Mr Sayers now works full-time in agricultural machinery sales, but he remembers how the accident affected him.

Sanctions were also announced on exports of chemicals, electronics, machinery and metals to limit Russia's military capability.

Much of its exports go through the Tanzanian port of Dar es Salaam, as well as essential imports such as fuel and machinery.