Mother Teresa began the Missionaries of Charity to serve the "poorest of the poor", and in the Yemeni conflict four of the MC sisters were killed along with 12 others.

"Pope Francis was 'shocked and profoundly saddened' by the murder of four Missionaries of Charity and 12 other people at a home for the elderly in Aden, Yemen. Gunmen entered the building on Friday and went room to room, handcuffing victims before shooting them in the head.

"A message signed by the Vatican Secretary of State, Cardinal Pietro Parolin, said the Holy Father 'sends the assurance of his prayers for the dead and his spiritual closeness to their families and to all affected from this act of senseless and diabolical violence.'"