A dozen Secret Service agents providing security for Barack Obama's diplomatic mission to Latin America have been accused of misconduct.

According to an AP report, the misconduct involved prostitutes in Cartagena, site of the Summit of the Americas. A Secret Service spokesman did not dispute that.

The White House had no comment, but also did not dispute the allegations.

The alleged activities took place before Obama arrived Friday in Cartagena for meetings with 33 other regional leaders. Secret Service spokesman Ed Donovan said the agents involved were relieved from duty and replaced with other agency personnel.

"These personnel changes will not affect the comprehensive security plan that has been prepared in advance of the president's trip," Donovan said.