05/20/2012 4:58 PM. Shortly after the official part of the march ended few protest "leaders" asked to march West; away from the police barrier and the NATO convention. Some in the crowd encouraged to move east, towards the McCormick Center chanting: "Don't go West". Stalemate ensued. As the riot police inched towards the protesters multiple objects (mostly empty plastic bottles and trash) were thrown at them. Scuffle erupted. Medics tended to the wounded protestors. According to some reports few protestors suffered concussions. Tension intensified.