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.

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.

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