Tens of thousands of people have rallied in Mexico City to mark the 45th anniversary of the Tlatelolco massacre of student demonstrators. On October 2, 1968, just days before Mexico City hosted the Olympics, government forces opened fire on protesters in the Plaza de las Tres Culturas. The exact death toll remains unknown, but human rights activists say as many as 350 people were killed. To date, no one has been tried or convicted for the killings. On Wednesday, a protester described the 1968 student movement.

Citlali Hernandez, protester: “Specifically the student movement of '68 was demanding democratic rights that today allow us to mobilize and have the right to freedom of expression. They don't kill us anymore for pasting up posters, but we are seeing a kind of authoritarian government since Enrique Peña Nieto came to power.”

During Wednesday’s protest, at least 97 people were detained. Police reportedly attacked journalists and human rights monitors. The anniversary came amid mass protests by teachers against education reforms backed by President Enrique Peña Nieto.