The disappearance of the students six weeks ago has gripped and revulsed Mexico. Gang-linked police attacked the young men in the southern state of Guerrero on September 26, in violence that left six other people dead.
The confessions may have brought a tragic end to the mystery, which has sparked international outrage and triggered protests in the biggest crisis of President Enrique Pena Nieto's administration.
But at the young men's Ayotzinapa teacher-training college, exhausted parents of the victims refuse to accept they are dead until DNA tests confirm their identities, saying the government has repeatedly fed them lies.
Some parents said the announcement was aimed at allowing Pena Nieto to leave Sunday on a major trip to China and Australia, which has been shortened due to the crisis.
"They want Pena Nieto to go on this trip," said Felipe de la Cruz, a spokesman for the families.
Three suspected Guerreros Unidos gang members told investigators that local police handed them the students between the southern towns of Iguala and Cocula.
The students had traveled to the city of Iguala to raise funds but hijacked four buses to return home, a common practice among the young men from a school known as a bastion of left-wing activism.
Authorities say the city's mayor, worried that they would interrupt a speech by his wife, ordered the police to confront them. The officers shot at several buses, leaving three students and three bystanders dead.
If the confessions are true, the mass murder would rank among the worst massacres in a drug war that has killed more than 80,000 people and left 22,000 others missing since 2006.
The Iguala case has undermined Pena Nieto's assurances that authorities were finally reducing the cycle of murders plaguing the country.
