Why Bombing Investigations Should Focus on the Bombmaker

It's been two and a half weeks since the bombing of an Airbus 321 in Somalia, and though notorious terrorist group al Shabaab has finally stepped up to claim responsibility for the attack, investigators have yet to trace the person responsible for building the explosive device. That, and not the organization responsible, should be the authorities' focus as they uncover more details surrounding the explosion on Daallo flight D159....