Dozens of people have been injured in Guatemala in clashes between police and students protesting against education reform in the capital, Guatemala City.
Among those injured are the ministers for education and the interior, who were caught up in the clashes .
The protesters, who are studying to become teachers, object to changes which would see the length of their university course increase.
President Otto Perez Molina has called a meeting to end the protests.
Under the new plans, university courses for students studying to become primary school teachers will go up from three to five years.
Protests against the measure began more than two months ago, and still no agreement has been reached.
Police said Monday's clashes kicked off when the protesters confronted Education Minister Cynthia del Aguila.
Emergency workers said Ms del Aguila had a panic attack and fainted.
Interior Minister Mauricio Lopez Bonilla, who was at the scene of the clashes to command the anti-riot police, suffered an arm injured after an object was thrown by the students.
About 40 students were taken to hospital.