'Some of Mexico's missing students killed elsewhere'

At least nine of Mexico's 43 students believed to have been killed last year by a drug gang after being handed over by police were slaughtered elsewhere, public inquiry documents reveal.

Investigation documents posted on the website of Mexico's Attorney General's Office (PGR) on Sunday include contradictory testimony on where the students were incinerated, as one gang suspect testified that nine students were not killed at a garbage dump, Xinhua news agency reported.

Last year, officials had said police officers of Iguala, a town 200 km south of Mexico city, abducted the students on September 26, 2014 in Mexico city, where they were protesting.

After being handed over to the Guerreros Unidos drug gang, the 43 were killed and incinerated at a landfill in the neighbouring town of Cocula, according to official investigation results released last year.

However, in the newly released documents, suspects including drug gang members provided contradictory information as to how many bodies were burned at the landfill and how they were killed.

Last month, experts from the Inter-American Commission on Human Rights said they had found no scientific evidence after an independent investigation that all 43 were burned at the landfill.