cnn joins us from cart hey na. what s the latest on the investigation where it stance? reporter: well, as you pointed out, those two u.s. government sources telling cnn that in fact these secret service personnel did bring back several prostitutes to their hotels. now, it s still a little squishy as to some of the details after they brought them back to their hot hotel, but at some point according to these sources, there was a dispute overpayment, and then the police, the local police got involved. about a dozen secret service officers are involved in this scandal. we re told it s a mix of undercover agents as well as the uniform officers. they were not part of the president s protective detail but were part of the overall security team here in colombia. now, we do understand that president obama has been informed about this investigation along with secretary na poll tan oof homeland security, an investigation, an internal investigation is now under way. so dan, this clea