WASHINGTON - The US Secret Service said on Saturday it put 11 agents on administrative leave to investigate their alleged misconduct before US President Barack Obama's trip to a Colombia summit, and apologized for the distraction the incident had caused.

"This is standard procedure and allows us the opportunity to conduct a full, thorough and fair investigation into the allegations," it said in a statement, without giving any details of what occurred. A Colombian police source and The Washington Post said prostitutes were involved.

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"This incident is not reflective of the behavior of our personnel as they travel every day throughout the country and the world performing their duties in a dedicated, professional manner," the Secret Service said. "We regret any distraction from the Summit of the Americas this situation has caused."