Chicago Mayor Rahm Emanuel has cut short his vacation to Cuba amid renewed calls for his resignation over police shootings of African Americans. Over the weekend, Chicago police killed a college student and a grandmother while responding to a call the student, Quintonio LeGrier, was behaving oddly and carrying a metal bat. Police say they shot 55-year-old Bettie Jones by mistake. The shooting came as Mayor Emanuel already faced pressure to resign over the more than year-old police killing of 17-year-old Laquan McDonald amid allegations of a police cover-up. The officer who killed McDonald is to be arraigned in court today. A spokesperson for Mayor Emanuel said he was returning home to “continue the ongoing work of restoring accountability and trust in the Chicago Police Department.”