Federal immigration agents conducted a raid at a warehouse in Edison, New Jersey, on Wednesday, taking 29 people into federal custody.

The raid was conducted at the Smart Logistics and Freight Solutions warehouse, which houses several companies, including Amazon, FedEx, and UPS. The raid appeared to be the largest in the state since President Donald Trump took office in January.

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A Customs and Border Protection spokesperson told Univision that the agency carried out “a surprise inspection” of the warehouse and noted that the raid was a part of routine customs enforcement efforts, not necessarily immigration enforcement.

Workers at the warehouse said many of the detained were from Ecuador, Guatemala, Mexico, and Peru, according to the New York Times. Workers said federal agents did not state the purpose of the visit. They described a very chaotic scene, with about 20 agents storming through the front door and blocking points of entry and exit.

Amanda Dominguez, a community organizer at New Labor, an advocacy group that represents low-wage immigrant workers, said federal agents came to the warehouse without a warrant.

“We have Customs and Border Patrol holding the door open for their ICE counterparts to say they’re allowed in with us, and then they start doing immigration-related actions,” Dominguez said, according to News 12 New Jersey. “That is illegal. ICE still needs their own judicial warrant signed by a judge.”

This was reportedly the second raid this year in Edison, a New York City metropolitan town of more than 100,000 people, many of whom are immigrants. In July, federal agents raided a wine and liquor warehouse in Edison.

The immigration status of the workers involved in Wednesday’s raid is unknown.

Delaney Hall, an immigration detention center nearby in Newark, New Jersey, has been subject to several protests over the Trump administration’s immigration policies. It was the first detention center to reopen under the Trump administration.

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Newark Mayor Ras Baraka has said the conditions at Delaney Hall do not meet safety standards. He was arrested after trespassing at the center earlier this year, but his charges were dropped.

The Department of Homeland Security did not respond to a request for comment.