Agents had previously used the tactic to arrest immigrants and place them in sped-up deportation proceedings. For the past few weeks however, they've just been arresting people at will.
Detainees had described "horrific" and unsanitary conditions, with dozens of people packed into a single room, little food, and scant access to attorneys.
Longtime immigration court observers say that federal agents working for ICE have created an unprecedented atmosphere of terror in their quest to deport as many New Yorkers as they can.
After the fire truck pulled up to the federal building where more than 100 people are being held, a van of the sort ICE uses to transport detainees sped out past protesters.