At least six people have been killed and more than 100 injured in Mexico after a gunmen opened fire during clashes between police and striking teachers.
The violence erupted as police fired tear gas at protesters to end a week-long barricade of a road in Asuncion Nochixtlan, a town in Oaxaca state, where some vehicles were set on fire.
The National Education Workers Coordinator (CNTE) union has been leading protests in Oaxaca for days against an education reform and the arrest of two of its leaders.
The National Security Commission initially denied that officers were armed, charging that news pictures showing them with guns were “false.”
But federal police chief Enrique Galindo later said that an armed unit was deployed after unidentified people “fired weapons on police and the population.”
He added: “The teachers were not even involved in these things.
“There are reports of the presence of various violent groups that have headed the blockades of roads and strategic installations for days,” the federal and state governments said in a joint statement, urging the CNTE to distance itself from these unidentified groups.
The six fatalities were all civilians, said Oaxaca state public security secretary Jorge Alberto Ruiz Martinez.
Paramedics said that three of the dead had bullet wounds. One was a minor and the other two were 23 and 28.
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The paramedics spoke on condition of anonymity because they were not authorised to speak publicly.
It was not immediately clear how the other three were killed.
However the mayor of the Oaxaca town of Juchitan de Zaragoz, where similar clashes occurred, reported that a journalist covering the violence plus one other person had been shot dead.
Authorities did not specify whether the death toll of six included these two individuals.
Another 55 federal and state officers were injured, including eight by gunshots, Ruiz Martinez said. At least 53 civilians were injured.
At least 21 people were arrested.
The CNTE, considered a radical wing of a national union, denounced in a statement the “repressive action of the federal and state governments.”
Many of the injured were taken to the Asuncion Nochixtlan’s church before being transferred to hospitals. Several are in “critical” condition, the government said.
A municipal police officer, who requested anonymity, said a firebomb was thrown on the town’s municipal building.
Governor Gabino Cue said the police intervention was needed to restore food and fuel supplies on state roads.
Protesters, some wearing masks, also gathered in the tourist city of Oaxaca, the state capital, where they prepared Molotov cocktails and burned material on the street to form barricades near the central plaza in anticipation of the arrival of police.
Shops closed and the streets were deserted.
“The resistance is peaceful but we are preparing barricades for the evacuation and excessive repression by the government of President Enrique Pena Nieto,” said a spokesman for the CNTE’s Section 22 who declined to give his name for fear of reprisals.
“They didn’t want to have dialogue. They said there was no going back” on the education reform, he said.
The CNTE has staunchly opposed Pena Nieto’s education reform, which requires teachers to undergo performance evaluations.
The union has also been protesting last weekend’s arrest of the leader of its Section 22 in Oaxaca, Ruben Nunez, and his deputy, Francisco Villalobos. Nunez faces money laundering charges, while Villalobos has been accused of stealing textbooks.