WASHINGTON — Homeland Security Director Janet Napolitano this morning told the Senate Judiciary Committee that the allegations of a prostitution scandal at a Colombia hotel that involved a dozen Secret Service agents are “inexcusable” and a “thorough and full investigation is under way.”

She also said there was no risk to President Barack Obama from the incident.

Napolitano, who was facing questions from the committee for the first time since the scandal erupted earlier this month, said, “All 12...have either faced personnel action or been cleared or serious misconduct.

“We will not allow the actions of a few to tarnish the proud legacy of the Secret Service.”

Napolitano said part of the investigation will include a review of training to see “what if anything needs to be tightened up.”

When asked by committee Chairman Sen. Patrick Leahy, D-Vt., if agents are specifically training on issues related to having intimate relationships with foreign nationals, she said the training is “focused on professionalism, on conduct consistent of the highest moral standards.”

Napolitano also testified that the Secret Service Office of Professional Responsibility, which is investigating the incident in Cartagena, Colombia, had not received any similar complaints of misconduct in the past 2 ½ years.