New York City Mayor Eric Adams is set to house an influx of migrants in sprawling tent-like structures the administration is calling “Humanitarian Emergency Response and Relief Centers,” as the city faces a surge in arrivals of migrants from the southern border.

Photos released by the mayor’s office on Thursday morning showed the interior of a sprawling tent as big as a football field, lined with dozens of orange cots arranged in tight rows.

The planned shelters immediately set off alarm bells among advocates who have been working closely with migrants by helping to provide food, transportation, and other support while city and state agencies have been slow to meet their needs.

“‘Emergency’ tent cities become isolated refugee camps and, at worst, concentration camps,” said Ariadna Phillips with South Bronx Mutual Aid, who has been in contact with dozens of families helping provide assistance and supplies. “Instead, the city should be focused on openly permanent accessible housing for low-income and working class New Yorkers, including asylum seekers.”

An example of what the interior of a Humanitarian Emergency Response and Relief Center will look like.

Office of the Mayor of New York City

The city’s release said the administration planned to open two of the centers in the coming weeks. One on Orchard Beach would be for adults, while a second location for families was still being selected.

In the mayor’s release, the city said migrants arriving in New York City would stay at the relief centers for “approximately 24 to 96 hours, but potentially longer “depending on the situation.”

The centers would provide, “shelter, food, medical care, case work services.” Additionally, the mayor said the city would provide transportation to relatives’ homes or connections to the city’s shelter system.

The mayor’s office didn’t return a request for more details on the plan.

In a joint statement from the Legal Aid Society and the Coalition for the Homeless, the groups raised legal concerns about the centers, which would be overseen by NYC Health and Hospitals and the Office of Emergency Management.

The Legal Aid Society represents the Coalition for the Homeless in the ongoing lawsuit that resulted in the city’s 1979 Right to Shelter consent decree, which requires the city to provide a shelter bed to anyone who seeks it.

The groups were eager to know if the new shelters would meet the legal standards established by the consent decree. They also expressed concerns about so many children living in one large setting.

“We are deeply concerned with any scenario in which families with children would be relegated to congregate settings,” the groups said. “This practice, which has been widely condemned for its adverse and dangerous impact on this uniquely vulnerable population, is already subject to legal prohibitions.”

Joshua Goldfein, an attorney with the Legal Aid Society, said the city told them about the new plan but didn’t provide details. The groups have asked a series of follow up questions about whether the centers would meet the city’s legal requirements for providing shelter. They were still waiting for clarification, Goldfein said.

“We have a lot of questions about how this will work and whether it will be beneficial to people coming to New York and also how it will affect the shelter system,” he said.

The Adams administration has struggled to meet the legal standard required by the 1979 right-to-shelter decree, with advocates highlighting multiple violations of the law over the past several months that meant migrants were left sleeping in chairs or on the floors of intake centers overnight.

More than 13,000 migrants have arrived in New York City since the spring – 8,500 of whom are seeking housing in the city’s shelter system, according to the most recent estimates from the mayor. A young mother’s suicide on Sunday sparked more calls for additional support from the city to handle the burgeoning crisis.

Last week, ahead of Thursday’s announcement, Adams said the city was reassessing how it handled people seeking shelter, though he offered few specifics. Thursday’s announcement appeared to be the first indication of what he meant.

Kathleen Cash at Safety Net Project called the photos of the new shelters “devastating,” describing them as “short-term municipal refugee camps.”

“Housing is the answer, that's it," Cash said.