11 April 1960 – The body of Kim Ju-yul was discovered in Masan Harbor. Kim – still dressed in his uniform from Masan Commercial High School – had disappeared in the March 15 clashes. Authorities claimed that he had drowned, but many Masan residents did not believe this explanation and forced their way into the hospital where Kim's body was stored. At the hospital, they discovered that grenade fragments behind his eyes had actually killed him. In the following days, mass demonstrations broke out involving as many as 40,000 residents throughout the characteristically politically left-leaning city. During renewed clashes with police, police opened fire and killed several protesters. Once again, the US military was called in to help restore order. At this point, public anger with the government had grown to new highs and rebellion against the Rhee government mushroomed around the country. Authorities 8 declared martial law.