This was planned and executed by North Korea.
They forced that bus off the road and killed them in advance of the nuke/missile talks. Their media is now full of His Fatness comforting imagery in a hospital gown and crying along with Chinas ambassador to NK. Above the fold Workers Daily news, TV, etc to drive China and DPRK closer prior to talks. ANY foreigner who goes to NK takes his life in his own hands. Otto shows us that. This could is not be put past these absolute monsters.