Suicide bomb kills five, wounds 36 in Istanbul shopping district

By Nick Tattersall and Orhan Coskun ISTANBUL/ANKARA (Reuters) - A suicide bomber killed himself and four others in a central Istanbul shopping and tourism district on Saturday, wounding at least 36 people in the fourth such attack in Turkey this year. The attack will raise further questions about NATO member Turkey's ability to protect itself against a spillover of violence from the war in neighboring Syria. Turkey faces threats from Kurdish militants, whose insurgency has spread from the largel