Mayor Ras Baraka said he was "appalled" and "angry" and blasted ICE for also detaining U.S. citizens, including a veteran. ICE said citizens may be questioned during an investigation.

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

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.”