The students from a teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on Sept. 26. A mass grave was found near the town over the weekend, full of charred human remains.
"Mexico has become worse than a death camp. I never thought I would live to see something so horrible," said Mariela Lopez, a 56-year-old teacher from Mexico City as she walked under the hot afternoon sun down the capital's central boulevard.
Protesters carried photos of missing students and signs that read "Fascist government, assassin of . . .
