Medecins Sans Frontieres says that seven vaccination centres were targeted in fighting.

Elders and Islamic group help secure release of two kidnapped European relief workers.

Medecins Sans Frontieres confirms release of four workers seized earlier in the week.

Foreign ministry says government is in contact with kidnappers of Western aid workers.

Negotiations on for three Medecins Sans Frontieres staff being held by armed men.

Three Medecins Sans Frontieres staff being held by armed men, aid group says.

Abductors have released two foreign employees of Medecins Sans Frontieres.

Armed men abduct two foreigners working with Medecins Sans Frontieres.

Conditions in displacement camps are emblematic of country's humanitarian crisis.

Aid agency blames desperate living conditions for the spread of a deadly strain.