thousands turn out to show their respects in zimbabwe as the body of opposition leader morgan tsvangira returns home. also in the programme: can you see anything unusual about this picasso? we'll uncover the mystery hiding behind the masterpiece. hello. i'm nkem ifejika, and this is bbc world news. thousands of people in florida, including survivors of wednesday's mass school shooting, have taken part in a rally to demand tighter gun controls in the united states. the event took place outside the court building in the city of fort lauderdale, a short distance from the school where a former student, nikolas cruz, killed seventeen people. laura westbrook reports. chanting: no more! outside the federal courthouse in fort lauderdale, this was the message to lawmakers. among the protesters was emma gonzales, who took cover on the floor of her school's auditorium as a gunman started shooting. she had this to say to donald trump. if the president wants to come up to me and tell me to my face that it was a terrible tragedy and how it should never have happened and maintain telling us how nothin