Just before she left for school on the afternoon of 16 September last year, nine year-old Zin Nwe Phyo was thrilled to be given a new pair of sandals by her uncle.She made him a cup of coffee, put on the shoes and headed off to school, a 10-minute walk away in the village of Let Yet Kone in central Myanmar. Shortly afterwards, her uncle recalls, he saw two helicopters circling over the village. Suddenly they started shooting.