Mexico's human rights commission says the government's investigation into the fate of 43 missing college students is marked by failures and omissions in its procedures.

Commission President Luis Raul Gonzalez Perez says authorities have not attended properly to the victims in the case and lacked in diligence in their investigation.

The teachers college students from the southern state of Guerrero disappeared Sept. 26 while commandeering transit buses for a protest in Mexico City. Mexico's attorney general's office says the students were arrested by local police and handed over to a drug cartel, which killed and incinerated them in a garbage dump. The case has caused national protests and outrage worldwide.

Gonzalez on Thursday called for an end to the collusion between criminals and authorities in Mexico that marks this case.