Pope Francis is said to be "greatly saddened" by the murder of three Italian nuns in the African nation of Burundi.
The nuns, aged between 75 and 82, were discovered on Sunday after an armed robbery went wrong at a parish in the northern suburb of Bujumbura.
Police have detained two people for questioning.
The nuns were from the Italian Catholic diocese of Parma.
In a statement it said their deaths seemed to be "the tragic outcome of an armed robbery by a mentally unbalanced person".
Vatican Secretary of State Cardinal Pietro Parolin said: "Pope Francis has learned with great sadness of the murder of three nuns."
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