BEIRUT (AP) — The Islamic State group said Tuesday that its spokesman and senior commander has been killed while overseeing military operations in northern Syria, and threatened to avenge his death.The IS-run Aamaq news agency said Abu Muhammed al-Adnani was "martyred while surveying the operations to repel the military campaigns in Aleppo," without providing further details.His death, if confirmed, would be the latest blow to the Islamic State group, which has [...]