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.

U.S. immigration agents rounded up undocumented migrants as well as American citizens in a raid of a Newark, New Jersey, worksite on Thursday that the city's mayor said involved detaining a military veteran and violations of the people's rights.