Five U.S. servicemembers may be involved with an alleged prostitution scandal in Colombia that has ensnared a dozen Secret Service agents, the Defense Department said Saturday.

The five troops have been confined to their quarters in Colombia, and are under orders not to have contact with anyone, the Pentagon said. They have violated their curfew and “may have been involved in inappropriate conduct.”

“The conduct is alleged to have occurred in the same hotel where the recalled United States Secret Service agents were staying,” the Defense Department said. U.S. Southern Command Commander Gen. Douglas Fraser announced the military’s involvement and said he was “disappointed by the entire incident and that this behavior is not in keeping with the professional standards expected of members of the United States military.”