No charges over Dreamworld tragedy - police

Almost exactly a year after the Dreamworld tragedy on the Gold Coast that claimed four lives, police say they will not file criminal charges over the incident.

On October 25, 2017, Cindy Low, Roozbeh Araghi, Kate Goodchild and Luke Dorsett were killed when a malfunction on the Thunder Rapids ride flipped them off the raft they were travelling on.

After a thorough investigation into the incident, Queensland Police recommended no criminal charges be laid against anyone for the disaster in a two-volume submission to the coroner.

However, Dreamworld employees and the park's owner, Ardent Leisure, have been warned they could still face prosecution. The latter could receive fines of up to nearly AU$4 million ($4.5 million) and a six-year prison sentence if found guilty of health and safety breaches.

Workplace Health and Safety Queensland sent a report to the state's government in September. Its legal department is now assessing it to see if charges should be laid against Ardent Leisure.

"Police have recommended no criminal charges be laid, but obviously that's only a recommendation," a spokesperson told AAP.

"The coroner may come back with suggestions relating to prosecution."

Queensland Police also recommended an investigation into the incident, undertaken by the coroner.