did they show enough force between these clashes? there was only one person retained leading up to this event. >> it presents an acrimonious environment and there are clashes between both groups. one of the things that the police department needs to focus on is the separation of those groups. as our counterpart mentioned, you used an example of what happened in nice. vehicle attacks are more and more prevalent. it's a teachable moment for law enforcement because whenever we have these types of asemblances, we need to keep the vehicle traffic away. case in point, in a place like new york city, whenever we have demonstrations, one of the first orders of business is to ensure that there are no vehicles aligning the pedestrian route.