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

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.

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.

Tensions rise in Iowa as rumors of ICE sightings spread and Trump declares illegal immigration a national emergency.

According to a statement from ICE on the raid, agents "may encounter U.S. citizens while conducting field work and may request identification to establish an individual’s identi