CARTAGENA, Colombia (CNN) -- Twelve Secret Service agents sent to Colombia ahead of President Barack Obama were relieved of duty and returned home amid allegations of misconduct that involved prostitution, the man who tipped news agencies to the investigation told CNN Saturday.
The incident in Cartagena -- one of two security issues that occurred Friday -- overshadowed the start of the sixth Summit of the Americas, where the president was to focus on trade, energy and regional security with 33 of the hemisphere's 35 leaders.