EXCLUSIVE: Large numbers of single adult illegal immigrants are being released and transported into the U.S. in Texas via a small, unmarked office in a parking lot, video caught by Fox News on Sunday shows.

Fox News footage shows several federally contracted buses dropping off dozens of mostly male migrants at a parking garage in Brownsville, Texas. Black tarps were set up with a makeshift sign said "Border Patrol drop-off" above it.

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Fox News footage from Jan. 23, 2022, shows migrants being released into the US.

Fox News footage from Jan. 23, 2022, shows migrants being released into the US.

Fox witnessed men go into a small, unmarked office, then re-emerge moments later as multiple taxi cabs then showed up to collect the migrants -- who were then shuttled off to nearby Harlingen Airport. There were no children or migrant families among the groups.

Several of the migrants told Fox that they had crossed illegally that morning, paying approximately $2,000 per person to cartel smugglers. They also said they were flying to destinations including Miami, Houston and Atlanta.

Single adults are typically being expelled via Trump-era Title 42 public health protections. The Biden administration kept Title 42 in place but is not applying it to unaccompanied children or most migrant families. However, single adults have long been the easiest category of migrant to deport.

In a statement to Fox News, the city of Brownsville said its Office of Emergency Management, through federal assistance from the Federal Emergency Management Agency (FEMA), works to facilitate "the transfer of these migrants to their final destination by allowing them to use services to contact their families, NGOs, or a taxicab."

It confirmed that the parking garage serves as a staging area for migrants to be given travel information to "facilitate their transfer to their final destinations." Migrants can also be given a health screening there, a spokesperson said.

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Customs and Border Protection (CBP) said its agency was not involved in the release. An Immigration and Customs Enforcement (ICE) source who viewed the footage said they believed it was an ICE release.

ICE later told Fox News that ICE makes custody determinations on a "case by case" basis in accordance with law and considering the merits of each case. It also transports migrants to airports and transit hubs, and coordinates with non-governmental organizations to provide migrants with shelter, food, clothing and transport. The agency also confirmed that it has established an operations center in Brownsville to support individuals and manage COVID-19 testing.

 "U.S. Immigration and Customs Enforcement (ICE) focuses its civil immigration enforcement priorities on the apprehension and removal of noncitizens who pose a threat to national security, public safety, and border security," a spokesperson said. "Noncitizens processed under Title 8 are evaluated for a custodial determination based on their immigration and criminal background, applicable sections of law, and established processing criteria. Individuals deemed suitable for release are released in coordination with local partners and are subject to reporting requirements associated with their immigration proceedings."

The development comes just as CBP officially released its December border numbers -- showing 178,840 encounters in December, a slight increase over November, but significantly higher than the 73,994 encountered in December 2020.

The Biden administration has been struggling with the crisis at the border and is  re-establishing the Trump-era Migrant Protection Protocols (MPP) in response to a court order that found its dismantling of the program unlawful.

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Last week, the program -- which sees migrants returned to Mexico -- was expanded to the Rio Grande Valley sector. The returns are set to take place through the Brownsville port of entry.