A group of protesters broke down a door of Mexico’s National Palace on Wednesday while President Andrés Manuel López Obrador was giving his usual press conference. The protesters voiced opposition to the government’s lack of response to the disappearance of 43 students in 2014 in the “Ayotzinapa Case.”

In September 2014, students from the Raúl Isidro Burgos Normal School in Ayotzinapa were allegedly attacked by police in Iguala, Guerrero, while traveling to a demonstration in Mexico City. The confrontation resulted in 43 missing, six dead and at least 40 wounded people.

Wednesday’s protests were an expression of protesters’ growing dissatisfaction with the investigation into the 43 missing students. There has been little progress in the investigation into the students’ disappearances, even after calls different human rights organizations and the Inter-American Commission on Human Rights, through the Special Follow-up Mechanism for the Ayotzinapa Case. These groups have pointed out that Mexico has yet to answer for the students’ disappearances.

Despite the protesters’ actions on Wednesday, López Obrador did not interrupt the conference he was giving and did not agree to dialogue with them. He described the protest as “a vulgar act of provocation” that had been orchestrated by “his adversaries.”

The lawyer of some of the parents of the 43 missing students expressed that dialogue with the government has been “broken” and López Obrador’s strategy is to disqualify the protests, which is a sign to the parents that the investigations have gone stagnant.

Over the last few years, the protests of the bereaved and civil society have increased. With only few months left before the López Obrador leaves office, there are still no answers from the promised investigation.