Phantom, the girls could be exaggerating the extent to which they were intimidated. Or they were needlessly frightened by the innocuous.
Or, most probably, these were typical cops. When the girls got close to the car, they came from several directions shouting "Down on the ground!", "Hands up in the air!" and "Don't move!".
The frightened girls hurry into the car and lock the doors. Now the cops, half of whom are dressed like homeless, are shouting at the windows, spraying saliva like rabid dogs. No longer trying to id themselves and angry at perceived lack of respect, they try to take control through additional uncoordinated intimidation. Two of them use tasers on the vehicle, for the heck of it. Guns are drawn. Someone jumps on the hood. It's like zombie survival here.