Islamic State terrorists have murdered at least 500 members of the Yazidi sect in northern Iraq, burying some of their victims alive, including women and children, and kidnapped some 300 women, a Baghdad government minister said on Sunday. The Islamists’ drive north forced thousands of Yazidis to flee from their ancient home of Sinjar to the mountains and provoked the first US air strikes in Iraq since the American troop withdrawal in 2011.