A wave of bomb attacks hit Cairo on Friday (local time), killing six people and raising fears that an Islamist insurgency is gaining pace on the eve of the third anniversary of the uprising that toppled autocrat Hosni Mubarak. The violence underscored the struggle of authorities to tame an Islamist insurgency which has been gaining pace since the army toppled Islamist President Mohamed Morsi in July. In the most high-profile attack, a suicide car bomber struck a top security compound in central Cairo early in the morning and killed at least four people, security sources said. Another blast in the Dokki district killed one person. An explosion near a cinema on the road to the Pyramids of Giza...