Fifteen people were arrested Tuesday after 150 protesters gathered in Center City to rally against the Trump administration's ICE operations in.

One witness said a Philadelphia police officer hit a protester “wherever he could” despite the protester not offering any resistance.

Immigration and Customs Enforcement (ICE) is preparing to deploy tactical units to Philadelphia and multiple other Democrat-run cities, according to CBS News. The move comes amid heightened anxiety among the city’s immigrant communities and an uptick in immigration enforcement in the area. Here’s what we know so far.

Philadelphia is among five Democratic-led cities where President Trump is preparing to send ICE tactical teams ahead of nationwide protests.

Organizers designated Philadelphia as the lead city in a movement spanning the nation, with over 2,000 protests planned.

Two Philadelphia police officers suffered minor injuries and 15 protesters were arrested after a physical confrontation erupted Tuesday evening in Center City during a march denouncing deportations, police said.

This group, organized by SEIU Local 32BJ, is calling for the release of SEIU California President David Huerta, who was detained during protests.

Follow along for live updates as thousands of people nationwide have shown up at protests and rallies opposing ICE raids.