President Obama on Sunday said he expected a "thorough" investigation into allegations Secret Service agents were involved with prostitutes while on assignment in Colombia, according to media reports.

"If it turns out that some of the allegations that have been made in the press are confirmed, then of course I'll be angry," Obama said at a press conference, following a meeting at the Summit of the Americas, which he is attending in Cartagena, Colombia.

Obama's comments were his first public statements about the incident.

White House press secretary Jay Carney said this weekend that Obama was first made aware of the incident on Friday.

On Saturday, the Secret Service confirmed that eleven agents were placed on administrative leave, as the agency investigated allegations that they hired prostitutes in Cartagena.

The agency pledged to "conduct a full, thorough and fair investigation into the allegations," in a statement released Saturday.

“The Secret Service demands more from its employees and these expectations are met and exceeded every day by the vast majority of our workforce," said Secret Service Assistant Director Paul S. Morrissey.

The incident may invite congressional scrutiny. 

On Sunday, Rep. Darrell Issa (R-Calif.) said that the scandal could involve more than the eleven agents currently being investigated. 

The chairman of the House  Oversight and Government Reform Committee said he believed that this scandal was probably not the first of its kind.

“Things like this don’t happen once,” Issa said, in an appearance on CBS’s “Face the Nation.” “We think the number might be higher. We’re asking for the exact amount of all people ‘involved.’ ”

Issa said his committee would look “over the shoulder” of the agency as they investigated the alleged misconduct, but had not decided whether to hold hearings of his own.

Five U.S. servicemembers may also be involved with the incident, the Defense Department said Saturday.

The Pentagon said the troops were confined to their quarters and were under orders not to have contact with anyone.

The Secret Service agents recalled were replaced by a new security team and the agency said that at no time was the president's protection compromised.

The episode in Colombia was not the first time a member of Obama’s security detail was involved in an embarrassing incident.

Last August, an off-duty Secret Service agent was arrested for drunk driving in Iowa days before Obama was scheduled to arrive on a bus tour.