A religious crisis begins in Vietnam when the Diem government, controlled by a Roman Catholic family, breaks up demonstrations in the city of Hue and kills nine unarmed civilians in the process.
Buddhists have been protesting the government's bans of flags and parades celebrating the birthday of the Buddha. This starts a cycle of protests followed by violent government repression, then more protests. The crisis only ends in November when the Army of the Republic of Vietnam stages a coup against the Diem government.
The law against flying religious flags was actually implemented back in 1958, but it had only been rarely enforced until now. It's Vesak, the birthday of the Buddha and a time when Buddhists want to fly religious flags. One week earlier, Catholics in Vietnam were encouraged to fly Vatican flags at a government-sponsored celebration for Archbishop Ngo Dinh Thuc, Diem's brother.
It's impossible for Buddhists in Vietnam not to see this as a form of religious discrimination and oppression.