The murderers? Seven male members—from their own Muslim family—who apparently had doubts about the women’s “behavior” (that’s all the Gate Ahram report indicates for motive). Amina, the 54-year-old mother and her two daughters, Sana, 28 , and Madiha, 24, were strangled by their seven male relatives “because the family doubted the behavior of the mother and her two daughters.” Before hurling them into the Nile, their male relatives tied the murdered women to heavy iron objects, to ensure that the bodies do not resurface. Police have thus far found the body of the older sister, Sana, and currently trying to find the other bodies. Thus the “new” Egypt continues displaying very “old” characteristics—“old” as in Medieval.
Summarized by Coptic Solidarity original source, Gate Ahram