The parents of 43 students missing in Mexico have led a march of thousands of people in the capital to mark one year since their disappearance.
On Sunday, many carried photos of their loved ones in Mexico city, demanding justice.
The parents want the government to hand over the investigation to a special unit under international supervision.
They dispute the government’s account that the students were handed over by police in the city of Iguala to a criminal gang, which killed them.
A group of independent experts had suggested the students were killed because they unknowingly took control of a bus carrying illegal drugs, and the government did nothing to protect them.
The protesters on the streets in Mexico City called the march “a day of indignation” which allowed people to show their anger towards the government over the handling of the students’ disappearance.
Meanwhile, President Enrique Pena Nieto had announced the creation of a special team to look into the case.
The President had earlier met the families and said that he was on their side and he also wanted to get to the bottom of what happened.
The students disappeared on September 26, 2014 in Iguala in the southern Guerrero state.
They had gone there to gather for a commemoration in Mexico City.
The Federal Government had said local police from Iguala and the nearby town of Cocula had detained the students and turned them over to the local drug gang.
But a team of international experts sent by the Inter-American Commission on Human Rights spent six months reviewing the government’s investigation and found a number of flaws.
It concluded the bodies of 43 students could not have been burned at the rubbish dump in Cocula as the government maintained.
The government said that forensic experts had identified two of the students from the burnt remains recovered from the rubbish dump.