Al-Shabab fighters learning to kill on a shoestring

NAIROBI, Kenya — They have lost their leader, their ports, their checkpoints and their territory. They have lost thousands of men and much of their money. They do not have armored personnel carriers like Boko Haram’s. Or poppy fields like the Taliban’s. Or oil fields like the Islamic State’s. In the pecking order of the world’s leading terrorist groups, al-Shabab militants, based in Somalia, operate on a shoestring budget. But as the attack on a Kenyan university last week showed, they have become proficient in something terrible: mass murder on the cheap. In the past two years alone, bare-bones al-Shabab teams of young gunmen have struck across Kenya, at a...