CAIRO, Aug 14: Egyptian police bolstered their presence in the capital on Friday in anticipation of protests on the second anniversary of the mass killing of Islamist demonstrators in which hundreds died. The Rabaa al-Adawiya killings, when police shot dead at least 700 hundred supporters of ousted Islamist president Mohamed Morsi as they dispersed a protest camp, has remained a rallying point for the country's harried Islamist opposition.     ?AFP