The Secret Service is investigating whether employees hired strippers and prostitutes in advance of President Barack Obama's visit last year to El Salvador.
The news comes a day after Homeland Security Secretary Janet Napolitano told skeptical senators that the Colombia incident appeared to be an isolated incident.
A spokesman for the Secret Service, Edwin Donovan, said they were investigating allegations from anonymous sources that Secret Service employees received sexual favors from strippers at a club in San Salvador and took prostitutes to their hotel rooms ahead of Obama's visit to the city in March 2011.
Prostitution is legal in both Colombia and El Salvador.
The Washington Post reported this week that similar behavior had been tolerated in the past, citing Secret Service sources. The Post described a visit to Buenos Aires in 2009 by former President Bill Clinton, whose protective detail, which included agents and uniformed officers, went out for a late night of partying at strip clubs.
Donovan said Thursday, "Any information brought to our attention that can be assessed as credible will be followed up on in an appropriate manner."
The Associated Press contributed to this report.