The Somali extremist group Shabab faced a new setback after one of its top surviving commanders was reported killed in a U.S. drone strike.#108;Related EuropeTurkey detains Syrian suspected of helping British girls join Islamic StateSee all related 8 U.S. officials familiar with the operation confirmed that a drone strike was launched Thursday in Somalia aimed at a key leader of the Al Qaeda-linked group, but they said authorities were still trying to verify whether the suspect had been killed. Islamic State accepts Boko Haram's allegiance pledge Robyn Dixon Islamic State has accepted a pledge of allegiance by Nigerian extremist group Boko Haram,...