HARARE – Two suspected armed robbers were killed in a shootout with detectives in Harare on Tuesday, including a South African national, police said. Four other men, three of them South African and one Zimbabwean, were arrested and face charges of conspiracy to commit armed robbery and possession of firearms. Jabulani Ngobeni, 45, of Tzannen in Limpopo was shot dead after firing at detectives at a…