Mexican authorities say they have captured the suspected leader of a criminal gang allegedly involved in the disappearance of 43 students.Sidronio Casarrubias Salgado is said to be the main leader of the Guerreros Unidos (United Warriors) gang.
The students, from a teaching college near Iguala in western Guerrero state, were last seen being bundled into police vehicles three weeks ago.
It came during clashes with police during a demonstration.
There have been demonstrations in support of the students across Mexico.
Mexico’s attorney general Jesus Murillo Karam said the arrest would open up new lines of investigation into what had happened to the students.
He added that 36 police officers and 27 members of Guerreros Unidos had already been arrested.
The mayor of Iguala, Jose Luis Abarca, is also being sought by police on organised crime charges along with his police chief.
The congress in the state of Guerrero has impeached the mayor.