Mexican authorities are investigating the death of three inmates inside a prison in the resort city of Acapulco.

Guerrero state prosecutors say in a statement the three men died Monday but released few other details.

Spokesman Jose Villanueva says investigators are waiting for autopsy results to determine a cause of death.

Prosecutors say the inmates had been sentenced to at least eight years in prison for robbery and homicide.

They had been transferred to Acapulco from a prison in Iguala, where five gunmen and four inmates died in a shootout last week.

Authorities said a group of gunmen managed to enter the facility and opened fire, killing the inmates. Guards killed the gunmen.

Prosecutors haven't said if the slayings of the three inmates is linked to the shootout.