Officials with the U.S. Northern Command said that they started work Monday to prepare Buckley for use by Homeland Security as a temporary detention center.

Federal agents interrupted a party at a "makeshift nightclub" north of Denver early Sunday morning and arrested almost 50 people of undetermined immigration status, a large number of whom are reportedly affiliated with the Venezuelan Tren de Aragua gang.

How many people arrested Sunday were connected to the TdA gang is unclear, but DEA officials said the number was in the dozens.

Drug Enforcement Administration officials said many of the immigrants were connected to Tren de Aragua and are in Immigration and Customs Enforcement custody.

Federal law enforcement agents took almost 50 people, including many who were undocumented, into custody Sunday in Adams County.

The Drug Enforcement Administration on Sunday morning detained 49 people in Adams County, Denver7 spoke with immigration advocates to hear their reactions and concerns to the raid.

Also Tuesday, Colorado Public Radio and CBS4 were among outlets that reported the U.S. military was preparing space at Buckley Space Force Base in Aurora for staging, processing and temporary holding of “criminal aliens” detained in ICE operations, according to a U.S. Northern Command statement.

Immigration and Customs Enforcement (ICE) postponed an immigration crackdown operation in Aurora, Colorado claiming knowledge of the effort had spread throughout the community and agents could be affected.

Undocumented immigrants have rights during arrests, a local hotline to detect ICE raids and other tools to handle deportations.

Federal agencies working in California pledged cooperation in immigration enforcement operations and posted photos of people being taken into custody.

Under Colorado law, local law enforcement agencies are limited in their interactions with U.S. Immigration and Customs Enforcement (ICE).