Suicide bomber kills four, wounds 36 in Istanbul shopping district

By Nick Tattersall and Ayla Jean Yackley ISTANBUL (Reuters) - A suicide bomber killed two Israelis and two other people on Saturday in a busy shopping district in the heart of Istanbul, the fourth such attack in Turkey so far this year. Prime Minister Ahmet Davutoglu said the blast was "inhumane" and would not stop Turkey, which has been targeted by Kurdish militants and Islamic State in recent months, from fighting "centers of terrorism". The explosion killed at least two Israeli citizens, Prim