The most violent conflict happened a few days later in reaction to the continuing war in Cambodia and the Kent State Shootings in Ohio that had left four students dead. Around 8000 protestors and 5000 policemen occupied the space in front of the building, which had been reinforced with barbed wire and other barriers due to heightened security concerns. Some of the more militant protestors tried to charge through the barriers with bottles, stones, and other weapons. The police held back the protestors with water hoses. During the incident a civil servant took out his gun and fired three shots, injuring an innocent bystander and a colleague. In total, 44 people were arrested and 231 policemen and an unknown number of demonstrators were injured.