Gunmen shoot at Nigeria Islamic leader's convoy in Kano

KANO, Nigeria (Reuters) - Gunmen opened fire on the convoy of one of Nigeria's most senior Islamic leaders in the northern city of Kano on Saturday, killing four people, although the Emir of Kano himself escaped unhurt, authorities said.

Violence has worsened in Kano, the north's main city, in the past week, with near daily attacks by Islamist sect Boko Haram against security forces.