Fire engines stand beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, Turkey, June 7, 2016. REUTERS/Osman Orsal

Fire engines stand beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, Turkey, June 7, 2016. REUTERS/Osman Orsal

Fire engines stand beside a Turkish police bus which was targeted in a bomb attack in a central Istanbul district, Turkey, June 7, 2016. REUTERS/Osman Orsal

June 7, 2016 9:15 AM (UTC+8)