They were divided into three large black vehicles.  In the front one, Draco climbed in with Theo, Lovegood, Pansy, and Granger, which meant they also got Jansen and Newport crammed in with them.  As soon as the doors were closed, the vehicle began moving.  There was a shrieking siren sound, flashes of blue, white, and red lights, and then they were let out onto the street.