Denver police arrested 18 individuals during an "ICE Out!" immigration protest, with tensions over ICE policies sparking demonstrations and officials responding to potential conflict.

ICE activity in downtown Los Angeles was part of an effort to serve warrants at a business believed to be involved in a slew of cross-border crimes.

Hundreds of Baltimore-area immigrant advocates rallied Wednesday to protest what they say is the detention of at least 16 people in the city and county by Immigration and Customs Enforcement officials in the last three weeks.