NORTH Korea could detonate its largest ever nuclear “city-busting” bomb today as it ramps up its fight against the United States. CIA officials and US generals are extremely concerned the hermit kingdom could set off a bomb, or at least test another missile over the next 24 hours. They fear Kim Jong-un could choose today as it is is the founding anniversary of North Korea’s ruling Worker’s Party. On Monday they were highly concerned Kim would choose to bomb the US on that day as it was Columbus Day. Russian lawmaker Anton Morozov, who returned from Pyongyang last week, warned...