The Qasba–Aligarh massacre was an ethnic clash that erupted when recently settled armed tribal Pashtuns from KPK, Pakistan and Afghanistan attacked densely populated civilized locals in Qasba Colony, Aligarh Colony and Sector 1-D of Orangi in Karachi in the early hours of the morning on 14 December 1986. According to official reports, around 49 people were killed (unofficial reports are significantly higher at 400) and several hundred were injured in what was perceived as a "revenge killing" by newly settled armed Pashtuns following an unsuccessful raid on a Pashtun heroin processing and distribution center in Sohrab Goth by the security forces. Most of the residents of the two colonies happened to be Muhajirs like Biharis who had been freshly repatriated from Bangladesh.