and 21 women were involved. how did they uncover that? did they go back and look at the guest books? exactly. under the rules of this hotel guests had to be signed in by the person renting the room. and thus we have the names of the women involved and were able to determine a count. reporter: we have also learned of the 11 secret service men involved two were highly paid supervisors, three were members of the counterassault team and three were members of the countersniper team. ten members of the military are also being investigated. five members of the army s elite special forces, two navy sailors who were high-ranking enlisted men, two marines who were low-ranking enlisted men and one member of the air force. we know 11 agents and officers and then at least 10 military personnel. does this suggest that this was part of a culture? it raises questions about the culture. it s also very hard for me to believe that this is the only time that this has ever happened. i am wo
pelley: good evening. the unfolding investigation shows that 21 americans representing the u.s. secret service and four branches of the military went drinking last wednesday night in colombia and brought prostitutes back to their hotel. they were part of a team that was preparing security for president obama who attended the summit of the americas this past weekend in cartagena. norah o donnell is breaking more news on this story tonight and she joins us from the white house. norah? reporter: scott, tonight sources tell us that secret service agents were offered polygraph tests as part of the investigation. now, this comes as the scandal has broadened and we ve also learned that at least 20 colombian women were involved. we have learned that members of the president s security team in colombia were partying at this cartagena strip club less than 48 hours before the president s arrival last friday. called the play club, it was near some of those accused first met prostitut