A number of US Secret Service agents sent to Colombia to help protect US President Barack Obama at a regional summit have been sent home amid accusations of a sex scandal.
"There have been allegations of misconduct made against Secret Service personnel in Cartagena, Colombia prior to the president's trip," Secret Service special agent in charge Edwin Donovan said in a statement.
"Because of this, those personnel are being relieved of their assignments, returned to their place of duty, and are being replaced by other Secret Service personnel."
He did not specify what allegations had been made against the Secret Service staff, who were in Cartagena ahead of Mr Obama's arrival for the Summit of the Americas.
But at least one of the agents had been involved with prostitutes in the Colombian resort city, the Washington Post said quoting Jon Adler, president of the Federal Law Enforcement Officers Association.
A statement said that five US military personnel assigned to Secret Service staff are now facing a misconduct probe.
Mr Donovan stressed the Secret Service staffing changes "will not affect the comprehensive security plan that has been prepared in advance of the president's trip".
"The Secret Service takes all allegations of misconduct seriously. This entire matter has been turned over to our Office of Professional Responsibility, which serves as the agency's internal affairs component," he added.
Mr Donovan did not say how many agents had been sent home.
But the Washington Post said there have been other incidents involving Mr Obama's security detail.
These included an agent charged with second-degree murder after an incident in Hawaii in November ahead of an APEC summit, and one charged with drunk-driving while helping to arrange security for an Obama bus-trip in Iowa in August.
News of the scandal broke just as four home-made explosive devices went off, two in Cartagena and two in the Colombian capital Bogota near the US embassy, without causing any casualties or damage, police said.
