The brutal killing of a young woman in broad daylight on an Egyptian street has shocked the Arab world, bringing the country's gender-based violence crisis into the spotlight.

A Nigerian senator and his wife were remanded in custody in London on Thursday charged with plotting to have a 15-year-old boy brought into the United Kingdom to harvest his organs, police said.

For decades, Paul Kagame has ruled Rwanda with an iron fist in the mold of the archetypal strongman African leader.