This is awful. These four Missionaries of Charity, members of the order founded by Mother Teresa, were murdered along with the people they were caring for by members of an Islamic terrorist group in Yemen. As the vicar for Southern Arabia says, they were murdered in hatred of the faith, which makes them martyrs. A priest at the facility was taken by the terrorists.
May the souls of the faithful departed, through the mercy of God, rest in peace. Through the intercession of Blessed Mother Teresa, may they fly to the bosom of the Lord in heaven.