Lawyers representing the families of thousands of people who died of cholera in Haiti are planning to sue the United Nations for wrongful death. The lawyers say U.N. peacekeeper troops  inadvertently brought cholera to Haiti from Nepal after the 2010 earthquake that decimated the country. Since the cholera outbreak began in 2010, nearly 7,000 people have died and over 500,000 have been infected. The BBC's Mark Doyle  has been in Haiti investigating the situation and filed this report.