"I think the questions that we're asking now and we don't have yet complete answers to is, is this an individual who's acting in this way or is it some larger set of actors? You know, what are the motivations? Those are all questions that I think we have to ask ourselves," the president said.
The toll of wounded rose today to 43. Fort Hood officials said some of the casualties didn't report their injuries until later.
Fifteen victims remained hospitalized with gunshot wounds, and eight were in intensive care.