The Secret Service agents who brought prostitutes back to their hotel rooms in Colombia last week had copies of the president’s schedule in their rooms, which raises the issue of a potential security breach, officials told Reuters.

Secret Service personnel were in Cartagena in advance of President Barack Obama’s arrival at the Summit of the Americas, a trade conference, over the weekend. At least 11 were placed on administrative leave and flown back to the United States on Saturday when it came to light that they had hired prostitutes. Their security clearances have since been pulled, NBC News has learned…

It has also been revealed that among the Secret Service personnel involved were full-fledged agents, which further ratchets up the seriousness of the incident, officials told NBC News.