Ah, ok then. First kill off about 15 officers then go to the end of the street when you do there will be a blockade, when it opens up then there will be a scene where fire falls blocking your exit, next there will be an air conditioner- jump up it three times then climb across, then there will be a little ledge go down it and then go right. Jump down there will be about 6 precrime officers. Take them out and two punks after defeating them walk past the vehicle, and you are out of the riot.