And in Mexico, tens of thousands of people marched Saturday to mark the first anniversary of the disappearance of the 43 students from the Ayotzinapa Rural Teachers’ College in the southern state of Guerrero. The students disappeared after coming under attack by local police in Iguala. The case has sparked massive protests in Mexico and across the world as the parents continue to demand answers. An international group of experts has rejected the Mexican government’s accounts of events, saying the investigation was deeply flawed and pointing to the role the federal police and military played in the students’ disappearance. On Saturday, the mother of student Julio César Ramírez Nava, who was found dead after last year’s attack in Iguala, spoke out.

Bertha Nava Martínez: “For me, it was the most valuable thing in life, my son, but they took him away from me. Here I am, and I am going to fight until I breathe my last breath. I have said this to that corrupt president, that we are not going to stop, and I especially am going to stop him. Every day I am going to keep searching for these 43 boys, because in this moment no one knew that they were going to sacrifice three boys leaving, two gravely injured and 50 other people injured. No one knew that they were going to take away 43, but they took them. These deaths will not be in vain, people. If it is necessary to give up my life, here I am giving it up, and I will continue to give it up.”

Bertha Nava Martínez’s son, Julio César Ramírez Nava, is not one of the 43 students who are still missing.