Some were found in their homes or at school, and a search was continuing for the 43 teachers college students still unaccounted for, state Prosecutor Inaky Blanco said yesterday.
Earlier, the head of the state human rights commission, Ramon Navarrete, said some of the students had fled the shooting, and some were detained and then released. He added that there were high hopes of finding the rest.
Student activists linked to the Ayotzinapa normal school are known for their radical protests.
Twenty-two police officers from the city of Iguala have been detained.
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Blanco said Iguala police officers participated in both attacks, and did not rule out the possibility that organized crime may have also been involved.
Guerrero Gov Angel Aguirre said he had contacted federal authorities to request help in keeping the peace in parts of the state.