Human traffickers shot dead an Egyptian police officer in Sinai on Sunday, Palestinian news agency Ma'an quoted security officials as saying.According to Egyptian officials, two 4x4 vehicles approached the Israel-Egypt border carrying African migrants and opened fire on the Egyptian officer, who was guarding a border post south of the Kerem Shalom crossing with Israel.Ma'an reported that the officer returned fire, but was shot in the chest and pronounced dead at a hospital in Rafah.The assailants fled the scene, Ma'an stated.