Six months ago, a member of the Nigerian radicalIslamist group Boko Haram drove a car laden with high explosives into theUnited Nations compound in Abuja and detonated it. The blast killed 23 peopleand injured more than 80. It was the first, and so far only, time the group hadattacked such an international target. But it has hardly been the only target.Since 2009, the group has killed at least 1,000 people. Almost every day sees anew attack or shootout in northeast Nigeria. Boko Haram has targeted churchesand police stations with particular ferocity. In January, militants killedscores of people in coordinated attacks in Kano, the largest city in the north.