Student organizations from Mexico's rural teachers colleges march to the capital's emblematic Zocalo square to demand justice on the 53rd anniversary of the Corpus Thursday massacre, known as the "Halconazo" in reference to an elite police force that repressed student protests on June 10, 1971, leaving between 20 and 30 reported dead according to the government and between 200 and 500 victims according to foreign media. During the march, demonstrators also hold signs in support of Palestine and demand justice for the disappearance of 43 students from the Ayotzinapa teachers' college in 2014. IMAGES AND SOUNDBITES