Immediately after the blast , people portraying some of the 150 " victims " stumbled amid the wreckage as emergency vehicles converged on the scene .
Immediately after the small explosion , people portraying victims stumbled amid the wreckage as fire trucks and other emergency vehicles converged .
Box cutters were used as a weapon by the Sept . 11 , 2001 , hijackers and have since been banned as carry-on items .