Istanbul on edge after suicide attack blamed on IS

Turkey on Sunday named the bomber behind a suicide attack in a busy Istanbul shopping and entertainment hub that killed four foreigners as a Turkish jihadist with links to the Islamic State group. The attack on the famous Istiklal Caddesi street sent shockwaves through the city, where a derby between arch-rivals Galatasaray and Fenerbahce was postponed Sunday after the authorities received information of what they called a "serious" threat. Interior Minister Efken Ala identified the alleged perp