Burundian refugees gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. Burundi President Pierre Nkurunziza on Sunday made his first public appearance in the capital Bujumbura since an attempted coup last week failed to oust him from power, saying he was monitoring a threat posed by Islamist militants from Somalia. (Photo by Thomas Mukoya/Reuters)

A Tanzanian policeman watches over as Burundian refugees gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, to they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee holds an umbrella as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, to wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee prepares food near their makeshift shelters as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, to wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A general view shows Burundian refugees as they prepare food within their makeshift shelters while they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, to wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee washes his kin as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, to wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees carry their belongings as they board a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania with their belongings, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania with their belongings, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees carry their belongings as they board a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees carry their belongings as they board a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees sail on a boat near the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees board a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A sick Burundian refugee is carried by paramedics for treatment from her makeshift shelter on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee carries his belongings as he boards a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania with their belongings, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees carry their belongings as they board a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees carry their belongings as they board a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees carry their belongings as they board a boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee holds her son as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania with their belongings, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee waits as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania with their belongings, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees sail on boat near the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A sick Burundian refugee waits for treatment at a makeshift clinic on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee waits as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania with their belongings, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee shaves her son as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania with their belongings, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee carries her sick child as she receives treatment at a makeshift clinic on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee prepares food near their makeshift shelters as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, to wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee carries his sick child as he receives treatment at a makeshift clinic on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee girl uses an axe to split firewood near their makeshift shelters as they gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, to wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Sick Burundian refugees sleep as they wait for treatment at a makeshift clinic on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee girl collects water on the shores of Lake Tanganyika in Kagunga village as they gather in Kigoma region of western Tanzania, to wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees gather on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 17, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees dry fish on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. Burundi's embattled President Pierre Nkurunziza sacked his defense and foreign ministers on Monday, five days after surviving an attempted coup by generals opposed to his bid for a third term in office. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee carries her belongings on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee child is pictured on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee child reads a book on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugee children bathe on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee cooks a meal on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)

A Burundian refugee cooks a meal on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees sit on a wooden boat on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)

Burundian refugees rest with their belongings on the shores of Lake Tanganyika in Kagunga village in Kigoma region in western Tanzania, as they wait for MV Liemba to transport them to Kigoma township, May 18, 2015. (Photo by Thomas Mukoya/Reuters)