There was "sheer horror" when survivors realised that the girls aged nine, 11 and 17 had died, a rescuer says.
Concern is mounting about "war-time levels of slaughter" in Nigeria, including a resurgence of jihadist activity.
Pope Leo XIV said he hoped Mauritian authorities would ensure the refugees are able to return home.
His lawyers accuse the government of trying to "coerce" him to plead guilty by threatening to deport him "halfway across the world".
"I felt like a Disney princess," says a prom goer about her dress, one of many custom-made in Nigeria.
"I felt like a Disney princess," says a prom goer about her dress, one of many custom-made in Nigeria.
"I left like a Disney princess," says a prom goer about her dress, one of many custom-made in Nigeria.
A selection of the week's best photos from across the African continent and beyond.
A selection of the week's best photos from across the African continent and beyond.
A selection of the week's best photos from across the African continent and beyond.