Ethnic Kachin rebels in north-eastern Burma are digging a new front line just three miles from the Kachin state capital of Laiza, after losing a series of their strategic mountain outposts in battles with the Burmese army.Related StoriesShares surge as China considers lifting ban on sales of games consoleBritish man Julian Ponder sentenced to six years in jail over Bali cocaine ringGoogle unveils never-seen-before map of North KoreaGunmen kill policeman escorting polio workers in PakistanPakistani policeman protecting polio workers shot dead