From small daytime gatherings to marches with thousands of people, protests condemning immigration enforcement operations have spread steadily across the United States. More are expected in the coming days.

Some of the demonstrations were organized by local residents after being surprised by sudden immigration raids; others are part of planned efforts by organizations like the Service Employees International Union, the Party for Socialism and Liberation and the 50501 Movement, a progressive political group.

While the protests have been mostly calm, there have been several instances of violence and unrest. In Los Angeles, a few cars were set on fire and some people threw rocks and bottles at law enforcement. About 200 people were arrested on charges of failure to disperse after the curfew took effect downtown, according to a statement by the Los Angeles Police Department. And in Philadelphia, 15 people were arrested including one man who was charged with assaulting an officer during a confrontation between protesters and the police.

Here are where some of the protests have happened.

Atlanta

On Tuesday evening, a crowd of over 1,000 demonstrators gathered in the heavily Hispanic and Asian American enclave of Buford Highway in metropolitan Atlanta. The group dwindled quickly after police ordered people to disperse. Shortly afterward, law enforcement deployed chemical irritants and charged the remaining crowd with riot shields. A total of six people were arrested in the protests, according to the Brookhaven Police Department.

Austin

A crowd of several hundred people gathered at the State Capitol grounds on Monday evening. After some refused to disperse at 8 p.m., the official end time of the march, the Austin Police Department blocked marchers and fired tear gas canisters into the crowd, according to the Texas Tribune.