Tens of thousand of protesters gather on Zocalo, the city's main square, during a massive march in support of the 43 missing Ayotzinapa’s students, on a day normally reserved for the celebration of Mexico's 1910-17 Revolution, in Mexico City, Mexico on November 20, 2014. Parents of the 43 missing students still do not believe the official line that the young men are all dead. Criticism of the government has intensified in Mexico and the country has been convulsed by protests. Many are demanding justice and that the search for the 43 missing students continue until there is concrete evidence to the contrary. Mexico officially lists more than 20 thousand people as having gone missing since the start of the country's drug war in 2006, and the search for the missing students has turned up other, unrelated mass graves. (Photo by Bénédicte Desrus)