Mexico teachers clash with police in Zocalo Square
14 September 2013 Last updated at 02:44 BST
Police in Mexico City have clashed with protesters during an operation to clear a square occupied by striking teachers.
Riot police, backed up by tanks and helicopters, broke through the barricades set up by the teachers shortly after a deadline for them to disperse passed.
Some demonstrators responded with petrol bombs.
The teachers have been demanding changes to education reforms approved by President Enrique Pena Nieto.
Will Grant reports.