A protester cries as she’s rounded up by police and human rights observers try to reach her, left, during a march near the airport in Mexico City, Thursday, Nov. 20, 2014. Protesters marched to demand authorities find 43 missing college students, trying to step up pressure on the government on a day traditionally reserved for the celebration of the 1910-17 Revolution. (AP Photo/Marco Ugarte)
APTOPIX Mexico Missing Students
