Two Pakistani coast guards were killed on Saturday when a bomb exploded under their vehicle, police officials said, in a town in the southwest which has been hit hard by years of separatist violence. The blast, which also injured three coast guards, completely destroyed the vehicle during a patrol on the outskirts of Jewani town in Baluchistan province, the police officials said. No one has claimed responsibility for the explosion. Jewani lies in Gwadar district, whose port is at one end of the proposed $46 billion China-Pakistan Economic Corridor stretching from the Arabian sea to China's Xinjiang region. Separatist groups in Baluchistan…