Turkish Vice President Fuat Oktay said he assumed Sunday’s deadly explosion on a major Istanbul pedestrian avenue was a “terrorist attack.” A suspect detonated a bomb, he said, without giving further details as to who was behind the attack. Oktay put the number of people injured in the afternoon bombing on the busy Istiklal shopping street at 81. Earlier, officials had put the number at 53. He said the number of fatalities continued to stand at six.