Three cartel members held over disappearance of 43 Mexican students
Three more suspects have been arrested over the disappearance of 43 Mexican students 16 months ago.
National security commissioner Renato Sales said the suspects belong to an organised crime group that authorities believe received the students after they were taken by police in Iguala, Guerrero state.
Six other people were killed on the night of September 26, 2014, including 22-year-old student Julio Cesar Mondragon.
Mr Sales said one of those arrested is considered the prime suspect in Mr Mondragon's death.
The authorities have arrested 113 people over the disappearances, including the ex-mayor of Iguala.
Government investigators have said that police handed the Ayotzinapa teachers' college students over to members of the Guerreros Unidos cartel.
The search continues for the students.