North Korea's Kim puts army on alert; U.S. warns it can intercept missile

By Idrees Ali and Christine KimWASHINGTON/SEOUL (Reuters) - Defense Secretary Jim Mattis warned on Monday that the U.S. military would be prepared to intercept a missile fired by North Korea if it was headed to Guam, while North Korean leader Kim Jong Un alerted his army that it should always be fire-ready.Mattis told reporters that the U.S. military would know the trajectory of a missile fired by North Korea within moments and would "take it out" if it looked like it would hit the U.S. Pacific