A demonstrator reacts during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico, September 24, 2022. The sign reads: "it was the army". REUTERS/Luis Cortes 

Demonstrators hold signs reading "it was the army" during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico, September 24, 2022. REUTERS/ Luis Cortes 

Ayotzinapa students throw objects as they enter the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Protestors gather outside the Campo Militar No. 1, ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Police gather at the Campo Militar No. 1 during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator uses spray paint on the walls of the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators hang signs on the walls outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators hold up banners outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator uses spray paint on a sign at the entrance to the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators hold signs reading "it was the army" during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, outside the Campo Militar No. 1, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator holds a poster reading "it was the army" outside the Campo Militar No. 1,during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator uses spray paint on the walls outside the Campo Militar No. 1,during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator sprays signs on the walls outside the Campo Militar No. 1,during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A poster reading "it was the army" hangs on the wall outside the Campo Militar No. 1, as police line up inside, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators gather outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators gather outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators gather outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Posters reading "it was the army" hang above the entrance to the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator hangs posters reading "it was the army" on the walls of the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator sprays the word "murderers" on the walls of the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators spray signs on the walls of the Campo Militar No. 1,during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators hold signs reading "it was the army" during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, outside the Campo Militar No. 1, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator throws an object towards a police line in the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators hold up banners outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Police gather at the Campo Militar No. 1 as demonstrators throw incendiary devices during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators push down a barrier at the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator throws an object into the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students attend a protest outside the Campo Militar No. 1, ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators prepare to enter the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators raise their fists during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, outside the Campo Militar No. 1, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators enter the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators hold up banners outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators hold up banners outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Police gather at the Campo Militar No. 1 as demonstrators throw incendiary devices during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Police gather at the Campo Militar No. 1 as demonstrators throw incendiary devices during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Police gather at the Campo Militar No. 1 as demonstrators throw incendiary devices during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Police gather at the Campo Militar No. 1 as demonstrators throw incendiary devices during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Demonstrators raise their fists during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, outside the Campo Militar No. 1, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

An Ayotzinapa student uses a slingshot outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students prepare to throw an incendiary device at the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students pull open the gate to Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students pull open the gate to Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator uses a slingshot outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students throw objects as they enter the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students attempt to enter the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students use slingshots outside the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students prepare to enter the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students enter the Campo Militar No. 1, during a protest ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students attend a protest outside the Campo Militar No. 1, ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Ayotzinapa students attend a protest outside the Campo Militar No. 1, ahead of the 8th anniversary of the disappearance of 43 students from Ayotzinapa Teacher Training College, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Relatives of 43 missing students from Ayotzinapa Teacher Training College and demonstrators hold a protest outside the Campo Militar No. 1, ahead of the 8th anniversary of their disappearance, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

Relatives of 43 missing students from Ayotzinapa Teacher Training College and demonstrators hold a protest outside the Campo Militar No. 1, ahead of the 8th anniversary of their disappearance, in Mexico City, Mexico September 23, 2022. REUTERS/Henry Romero 

A demonstrator paints graffiti during a protest ahead 8th anniversary of the student's disappearance from Ayotzinapa Teacher Training College, in Mexico City, Mexico, September 22, 2022. REUTERS/ Luis Cortes 

A demonstrator throws an object toward police officers during a protest ahead 8th anniversary of the student's disappearance from Ayotzinapa Teacher Training College, outside the Attorney General’s office, in Mexico City, Mexico, September 22, 2022. REUTERS/ Luis Cortes 

A demonstrator throws an object toward police officers during a protest ahead 8th anniversary of the student's disappearance from Ayotzinapa Teacher Training College, outside the Attorney General’s office, in Mexico City, Mexico, September 22, 2022. REUTERS/ Luis Cortes 

A police officer is helped after being hit during a protest ahead 8th anniversary of the student's disappearance from Ayotzinapa Teacher Training College, outside the Attorney General’s office, in Mexico City, Mexico, September 22, 2022. REUTERS/ Luis Cortes 

A police officer is helped by his colleagues after being hit during a protest ahead 8th anniversary of the student's disappearance from Ayotzinapa Teacher Training College, outside the Attorney General’s office, in Mexico City, Mexico, September 22, 2022. REUTERS/ Luis Cortes 

Relatives and demonstrators gesture during a protest ahead of the 8th anniversary of the student's disappearance, outside the Attorney General's office, in Mexico City, Mexico, September 22, 2022. REUTERS/Luís Cortes 

Relatives and demonstrators hold banners with images of the missing students from Ayotzinapa Teacher Training College during a protest ahead of the 8th anniversary of the students’ disappearance, outside the Attorney General's office, in Mexico City, Mexico, September 22, 2022. REUTERS/Luís Cortes 

Relatives and demonstrators hold a banner as take part in a protest ahead of the 8th anniversary of the student's disappearance, outside the Attorney General's office, in Mexico City, Mexico, September 22, 2022. REUTERS/Luís Cortes