Yesterday, the students from the Rural Normal School at Ayotzinapa were in the southern city of Iguala hijacking buses. Local police intercepted them and turned them over to a local drug cartel.
The government's initial investigation decided the students were killed and incinerated in a fire, but international experts have cast doubt on this theory and the families have not accepted it.
"Our fight continues firm; we're still standing," said Clemente Rodriguez from Tixtla in the southern state of Guerrero, whose son Christian is among the missing.
Felipe de la Cruz, a spokesman for the families, said the two years have been hard on relatives who have worked to maintain pressure on the government by demonstrating all over the world.
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"There are illnesses, there is exhaustion, there psychological torment, day after day to sleep and wake to the same situation," he said.
Last week, Alfredo Higuera, the special prosecutor on the case, said the federal Attorney General's Office planned to make a fifth forensic examination of the dump site in Cocula where the students were allegedly burned.
Authorities have so far arrested 128 people. Seventy of those, mostly police officers and alleged cartel members, are currently being prosecuted. A number of them have alleged torture by officials and it is unclear how that will affect their cases.