Mexican authorities found four new mass graves in Iguala, Guerrero, amounting for a total of nine so far, even though it is not possible to determine the number of victims or their identities, according to the head of the Attorney General's Office (PGR) Jesús Murillo Karam, who said that it is too soon to determine if they are the 43 student teachers who disappeared on September 26 in the area.

The reasons for their killing have not been determined so far.

Murillo Karam added that four detainees informed about the location of the mass graves near Iguala, and burned bodies were found inside. According to the authorities, they could be members of the Guerreros Unidos gang, while forensic experts are working to identify them.

During the investigations on the criminal aggression against students from the teachers school in Ayotzinapa and the disappearance of 43 youngsters, the PGR ordered the arrest of the mayor on leave of Iguala, José Luis Abarca, as well as his wife María de los Ángeles Pineda, and the head of public security, Felipe Flores Velázques, all of them on the lam.

The PGR also called a member of the leftist Democratic Revolutionary Party, René Juvenal Bejarano Martínez, in order to declare before the Office for Special Investigations on Organized Crime (SEIDO) due to his recent comments about the homicide of former counselor of Iguala, Arturo Hernández Cardona, and the supposed participation of Abarca in that crime, committed in May 2013.

With the arrests announced by Murillo Karam there is a total of 34 detainees in relation with Ayotzinapa, 22 of them former municipal police members, who are currently in a federal jail.