Day commemorating the January 9, 1964 anti-imperialist protests in Panama

Martyrs' Day is a Panamanian day of national mourning which commemorates the January 9, 1964 protests over the sovereignty of the Panama Canal Zone. The protest started after a Panamanian flag was torn and students were killed during a conflict with Canal Zone Police officers and Canal Zone residents. It is also known as the Flag Incident or Flag Protests.