Asked about other possible attacks , Roberts said : " I don 't think there 's any question about it that . . . they 're going to be very global in nature .
Asked about other possible attacks , Roberts said : “ I don ’ t think there ’ s any question about it that they ’ re going to be very global in nature .
The technology-laced Nasdaq Composite Index .IXIC was down 1.55 points , or 0.09 percent , at 1,744.91 .