Learning Detail News Today

That false report got started and how it circulated so quickly. im wolf blitzer, and we want to welcome the viewers in the united states and around the world. world. you are in "the situation room." -- captions by vitac -- www.vitac.com it happened suddenly leading to a lockdown in the pentagon and adjacent metro station, a gunman fatally shot after shooting two police officers. now, we are learning detail ags tbt gunman that sparked an urgent al lart. our correspondent barbara starr is lookin...