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.”

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.

Less than a week into his presidency, the Trump administration is touting deportation efforts and has published new rules making it easier to remove people.

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