On March 31, 1976, after the death of Zhou Enlai, Chi Qun demanded that "Tsinghua must not send a single flower wreath to Tiananmen". On April 3, some students sent white flowers to the Monument to the People's Heroes, becoming part of the Tiananmen Incident, known in Chinese as the April 5th movement. On the night of the 6th, Chi Qun referred to the movement as an "organized, purposeful, planned, sequential counterrevolutionary assault". Being defined as such, the movement was subjected to the arrests of "counterrevolutionaries" and the censorship of "counterrevolutionary political rumours". By June 10, more than 100 people had been investigated, 38 had been subjected to school-level isolation, and one person had been arrested.