8 Alas, in this pitiful state of affairs, We sadly note that there is very often no respect for the sacred and inviolable character of human life; that actions and methods are employed which openly flaunt the moral sensibilities and customs of civilized people. In this respect We cannot help but raise Our voice to defend the dignity of man and Christian civilization; to condemn secret and treacherous warfare, terrorist activities, the taking of hostages, and savage reprisals against unarmed people. These are crimes which debilitate man's awareness of what is just and humane, and further embitter the hearts of the combatants. These crimes can close off the paths still open to mutual good faith; or at least they can place more difficulties in the way of negotiations which, if conducted with sincerity and honesty, could lead to a reasonable settlement.
Source: Mense Maio (Vatican.va)