CNN Erin Burnett OutFront May 23, 2013 06:34:00
Concerned, that there is the possibility that these individuals weren't acting alone, that others may follow on with similar attacks. although we're not being told that officially. that meeting that took place here, the equivalent to the white house would be where the president goes into "the situation room." that was the level of meeting that was held here earlier today. erin? >> nic robertson, thank you very much. the crucial question, were they acting alone? obviously, not yet answers to that. just an absolutely unbelievable act. here in the u.s., surprising twist in the terror attack in th...