Fresh protests break out over black deaths in US

Fresh protests broke out in the United States over a white policeman killing a young black man. Nerves are raw because police involved in earlier such killings did not face prosecution. In an apparent act of retaliation, a black man with a history of violence shot dead two New York police officers. Aleem Maqbool in Washington tells us a complete change of mindset is required.
Also in the programme: the horrors for girls and young women captured by the group calling itself Islamic State; Mike Wooldridge returns to Ethiopia -- thirty years after the famine which changed the way we look at disaster; and what Pope Francis really thinks about the people who work for him at the Vatican. A clue: he's not impressed.