Immigration and Customs Enforcement (ICE) agents raided a Newark, New Jersey, business venue on Thursday and detained undocumented immigrants as well as U.S. citizens without warrants, the city's mayor said.

Newark Mayor Ras J. Baraka issued a statement late Thursday afternoon denouncing the raid as an “egregious act” conducted without a warrant and in violation of the Fourth Amendment of the U.S. Constitution, which guarantees “the right of the people be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures.”

Newark Mayor Ras Baraka confirmed in a statement that the federal Immigration and Customs Enforcement raided a business establishment in the city.

A U.S. veteran and Americans who are Navajo have been asked for identification. Critics are complaining of racial profiling as raids and deportations increase.

After a raid at a business in Newark, reportedly without a warrant, here's what to know about ICE and immigration enforcement in America.

The raid in Newark, New Jersey, came after President Donald Trump signed a series of executive orders on his first day in office cracking down on immigration and the U.S.-Mexico border.

ICE said it conducted a 'targeted enforcement operation at a worksite' in Newark but did not disclose details. The owner of a restaurant said three of his workers were taken into custody.

Senate Majority Leader Teresa Ruiz took to the podium in Newark City Hall on Friday, hours after immigration enforcement officials shocked the city in a job site raid — and

Immigration and Customs Enforcement agents appear to have stepped up their detention of unauthorized immigrants, taking more than 500 people into custody on Thursday, almost twice the average number of daily arrests late last year.

Tensions are high after Newark, New Jersey, mayor Ras Baraka said ICE raided ... is the product of a merger of the former U.S. Customs Service and the Immigration and Naturalization Service.

U.S. Rep. LaMonica McIver, D-10th District, said her office had asked agency officials for answers. “Already, Trump’s attacks on immigrant communities are hitting home, and we will not back down,” she said.

Newsweek understands Enforcement and Removal Operations officers have been particularly "enthusiastic" since Trump returned.