New Mexican President Andrés Manuel López Obrador has signed a decree to open a truth commission to investigate the disappearance of 43 students.
The student teachers were kidnapped from the town of Iguala in 2014, and subsequently killed, allegedly by members of the security forces.
The announcement was made on Mr López Obrador's first working day in office.
There have been no high-profile prosecutions for the murders, which shocked Mexico and the world.
The 65-year-old, popularly known by his initials Amlo, won a landslide…