Asking the international community to isolate and condemn terrorists wherever they attack, Prime Minister Manmohan Singh today said he will impress upon G-8 leaders to adopt an approach of "zero tolerance" towards terrorism anywhere."The international community must isolate and condemn terrorists wherever they attack, whatever their cause and whichever country or group provides them sustenance and support," Singh said in a statement before leaving for the 3-day G-8 Summit in St Petersburg."We will impress upon the leaders gathered at the G-8 Summit that the international community must adopt an approach of zero tolerance towards terrorism anywhere," he said.Observing that terrorism was a scourge that continues to inflict different parts of the world, he said the "tragic human costs that they entail was brought forth once again by the recent attacks in Mumbai and Srinagar".