CARTAGENA, Colombia — A dozen Secret Service agents sent to Colombia to provide security for President Barack Obama at an international summit have been relieved of duty because of allegations of misconduct.

A caller who said he had knowledge of the situation told The Associated Press the misconduct involved prostitutes in Cartagena, site of the Summit of the Americas. A Secret Service spokesman did not dispute that.

A U.S. official, who was not authorized to speak publicly on the matter and requested anonymity, put the number of agents at 12. The agency was not releasing the number of personnel involved.

The Washington Post reported that Jon Adler, president of the Federal Law Enforcement Officers Association, said the accusations related to at least one agent having involvement with prostitutes in Cartagena. The association represents federal law enforcement officers, including the Secret Service.

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