Expressing concern over the rising incidents of terror attacks on civilians, UN chief Ban Ki Moon has said that it cannot be justified for any reason and should be prevented. Moon, however, declined to comment on whether the United States' military operations against militants in Pakistan territory, without the permission of Islamabad, constituted threat to world peace and security. "I think this is something that I need to mention. I am not in a position to make any comment on that," Moon said .General Ashfaq Parvez Kayani, had lashed out at the US-led coalition forces in Afghanistan over the cross-border raids in its tribal belt and vowed to defend the country's sovereignty and territorial integrity "at all cost". Moon said the United Nations is doing all it can to mobilise firm political will of international community to fight terrorism. "Protecting civilians in particular is very important priority for us." The world body, he said, is firmly committed to fighting terrorism in all in its forms and manifestations.