A White House official said earlier Friday President Barack Obama was briefed by the director of the Secret Service on the investigation into the agency's prostitution scandal.
The official said Obama was briefed in person by Secret Service Director Mark Sullivan Friday afternoon in the Oval Office.
The briefing came as a government official told The Associated Press a twelfth Secret Service employee has been implicated. The official says three agents were resigning Friday.
That brings the agency departures to six from the events at a hotel late last week in Colombia before Obama arrived for a summit meeting.
Eleven Secret Service employees had been noted earlier. The twelfth has been placed on administrative leave.
An Air Force colonel and a military lawyer have gone to Colombia as part of the military probe. ABC News has learned that investigators have interviewed some of the prostitutes involved in the scandal.
On Thursday, the White House expressed renewed confidence in the director of the Secret Service.
Mr. Obama's chief spokesman, Jay Carney said the president's security in Cartagena was never compromised, and he asked for patience as official investigations continue.
The Associated Press contributed to this report.