Buddhist discontent erupted following a ban in early May on flying the Buddhist flag in Huế on Vesak, the birthday of Gautama Buddha. Just days before, Catholics had been encouraged to fly the Vatican flag at a celebration for Archbishop Ngô Đình Thục of Huế, Diệm's elder brother. A large crowd of Buddhists protested the ban, defying the government by flying Buddhist flags on the Buddhist holy day of Vesak and marching on the government broadcasting station. Government forces fired into the crowd of protesters, killing nine people. Diệm's refusal to take responsibility—he blamed the Viet Cong for the deaths—led to further Buddhist protests and calls for religious equality. As Diem remained unwilling to comply with Buddhist demands, the frequency of protests increased.