Nearly 200 refugees fleeing Boko Haram militants have starved to death over the past month in Bama, Nigeria, the medical charity MSF says.

A “catastrophic humanitarian emergency” is unfolding at a camp it visited where 24,000 people have taken refuge.Many inhabitants are traumatised and one in five children is suffering from acute malnutrition, MSF says.The Islamist group’s seven-year rebellion has left 20,000 people dead and more than two million displaced.

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