Federal authorities have arrested more than 100 immigrants following a major raid on an underground nightclub operating in Colorado, officials announced per CNN. In a surprising twist, investigators say that active-duty military personnel were also found working at the illicit venue.

The raid, conducted by Homeland Security Investigations (HSI) alongside local law enforcement, targeted an unlicensed nightclub that had allegedly been operating outside legal and immigration guidelines. Officials say the establishment was tucked away in a commercial area and had been under investigation for months before the operation unfolded.

In addition to the arrest of over 100 immigrants — many of whom, according to officials, lacked legal authorization to work or reside in the United States — agents discovered that several active-duty service members were employed at the club in various roles, including security and bar operations.

“What was happening inside was significant drug trafficking, prostitution, crimes of violence,” Jonathan C. Pullen, special agent in charge at the DEA’s Rocky Mountain division, said at a news conference Sunday morning per the outlet. “We seized a number of guns in there.”

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Authorities have not publicly disclosed the identities of those arrested, nor specified the military branches to which the active-duty members belong. Officials said the service members’ involvement is under separate military review and investigation, which could result in administrative or criminal action depending on the findings.

The nightclub’s operators are also facing potential charges, including labor violations, licensing infractions, and possible human trafficking-related offenses if exploitation is found to have occurred.

Law enforcement officials emphasized that while the majority of immigrants arrested will be processed for immigration violations, efforts are being made to screen individuals for signs of human trafficking or coercion.

The raid has sparked renewed debate around labor exploitation, immigration enforcement, and the pressures faced by both undocumented workers and lower-ranking service members — many of whom may seek off-duty employment to supplement their incomes.

As the investigation continues, authorities say more arrests and charges could be forthcoming.