Three more Secret Service employees "have chosen to resign" in connection with an alleged prostitution scandal in Colombia, the agency says.
A 12th employee has been implicated as part of the ongoing investigation, according to a written statement.
Three agents already have left the Secret Service in connection with the allegations. Five others already were on administrative leave; one of them has now been cleared of serious misconduct.
A military spokesman said the total number of service members under a separate investigation for possible misconduct has increased to 11.
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