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Protesters have marched on the streets of Mexico as it emerged that a mayor and his wife were the "probable masterminds" behind the disappearance of 43 student teachers.
Thousands took to the streets of Iguala, in south-west Mexico, to protest against the disappearance of the teachers on 26 September.
Masked men smashed windows and used Molotov cocktails to set fire to the city's municipal offices after the protests.
Police also made several arrests after looting broke out in the city.
Police detain men after the demonstration in Iguala
It came as Mexico's Attorney General Jesus Murillo said Iguala Mayor Jose Luis Abarca and his wife, Marina de los Angeles Pineda, were possibly behind the students' disappearance.
Authorities have arrested 52 people in connection with the incident, including dozens of police who have been linked to a gang called Guerreros Unidos.
The gang's leader, Sidronio Casarrubias, was arrested last week.
Mr Murillo said Casarrubias had told prosecutors the mayor and his wife ordered two local police forces to stop the students from disrupting a political event on the day they went missing.
Stolen goods seen on the ground after the protests
"We have issued warrants for the arrest of Iguala Mayor Jose Luis Abarca, his wife Mrs Pineda Villa and police chief Felipe Flores Velazquez, as probable masterminds of the events that occurred in Iguala," he said.
Mr Murillo added that during the September incident, police shot and killed one student and detained the others before turning them over to gang members.
He said the gang then mistook the students for members of rival criminal group Los Rojos.
Authorities are continuing to investigate mass graves in an area where they have already found 30 bodies.
Initial examinations have shown none of the bodies belong to the students, reported SkyNews.