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Homeland Security Secretary Janet Napolitano is now facing questions from the U.S. Senate Committee on the Judiciary regarding the Secret Service prostitution scandal, which overshadowed President Barack Obama's visit to Cartagena, Colombia, for the Summit of the Americas.

Napolitano has said that the investigation has implicated 12 agents, eight of whom have been removed. The others were either cleared of the alleged misconduct or stripped of their security clearances.

The scandal erupted after a fight broke out between a Secret Service employee and a prostitute over payment. The fight escalated to the hallway of the Hotel Caribe, where the U.S. delegation was staying. About a dozen military personnel were also caught up in the incident.

The alleged prostitute has been identified as Dania Suarez, and reports were that she has since gone into hiding to escape the media attention.