Tear gas and flash bangs were deployed to disperse crowds protesting immigration raids in downtown Los Angeles after dozens of people were arrested by federal immigration agents Friday, including a prominent union leader.

Federal immigration authorities carried out enforcement activities at several locations in Los Angeles on Friday, with some clashes breaking out as crowds gathered outside a warehouse and other locations across the city to protest the activity.

Federal agents carried out large-scale ICE raids across Los Angeles, detaining dozens and sparking tense clashes with protesters in the city’s Fashion District. The LAPD did not take part, and many residents were alarmed to see heavily armed officials operating in a city known as a "sanctuary" for undocumented immigrants.

After a day of contention and little information about the nature of an immigration enforcement operation in Los Angeles, the Department of Homeland Security has finally released details about the joint operation conducted Friday morning.