NEW : Slain Catholics bishop 's driver captured in stabbing death , Catholic ministry says . Apostolic vicar of U.S. killed . Hoping that the deceased will rest in peace , we extend our most sincere condolences to his family , to our citizens of Christian belief and the entire Catholic community , '' the ministry said . Vatican : Tragedy shows `` difficulty '' of Catholics in the Middle East . U.S. agency : Catholics `` occasionally subjected '' to attacks .
NEW : Slain Catholics bishop 's driver captured in stabbing death , Catholic ministry says . Apostolic vicar of U.S. killed . Vatican : Tragedy shows `` difficulty '' of Catholics in the Middle East . U.S. agency : Catholics `` occasionally subjected '' to attacks .