Chilean officials have reopened the investigation into the death of Pablo Neruda to find out if the award-winning poet was poisoned.

The Chilean Nobel laureate was thought to have died from prostate cancer in 1973, but his former chauffeur Manuel Araya claimed the writer was poisoned while he was in a Santiago hospital.

Neruda's body was exhumed in 2013 to test the allegations, and forensic examinations on his remains found no trace of poison, but Chilean officials now want to continue testing the body for chemical agents and cellular or protein damage to finally determine a cause of death.

Francisco Ugas, head of the government's humans rights department, says, "There is initial evidence that he was poisoned and in that sense the signs point to the intervention of specific agents."

Neruda died aged 69.