EDITORS NOTE: Graphic content / Injured people get assistance on the scene of an explosion on the pedestrian Istiklal avenue in Istanbul on March 19, 2016. A suicide bombing ripped through a famous shopping street in central Istanbul killing four people and injuring dozens less than a week after an attack by Kurdish rebels left 35 dead in Ankara. / AFP / ETKIN NEWS AGENCY / STRINGER (Photo credit should read STRINGER/AFP/Getty Images)
