They were rallying for peace. But a march Saturday in Turkey’s capital, where demonstrators were calling for an end to hostilities between Kurdish separatists and the government, resulted in the nation’s deadliest-ever attack. Twin blasts near the capital’s train station killed at least 95 and injured nearly 300. Authorities say two suicide bombers were responsible for what President Recep Tayyip Erdogan has labeled a “loathsome” act of terror. The nation will now observe three days of mourning as it grapples with this tragedy, ongoing separatist violence and the fear of more terrorism.