MOSCOW (AP) — A senior Russian diplomat says the head of the Islamic State group has most likely been killed in a Russian airstrike. Deputy Foreign Minister Oleg Syromolotov told the state-run RIA Novosti news agency Thursday that "according to the Defense Ministry's information, there is a high probability that (Abu Bakr) al-Baghdadi has been killed when the Russian air force hit militants' headquarters on the southern outskirts of Raqqa in late May."