Dreamworld CEO Craig Davidson says the theme park will remain closed until after the funerals of the four people killed on a ride this week.

Mr Davidson said upon advice from parent company Ardent Leisure’s CEO, Deborah Thomas, the park would remain closed until “at least” that time, taking into account internal and external safety audits.

He also said around 400 to 500 staff attended a private memorial at the park today, alongside Gold Coast mayor Tom Tate.

The four victims of the Dreamworld tragedy: Luke Dorsett, Cindy Low, Kate Goodchild and Roozi Araghi. (Supplied)

Dreamworld originally announced they would open the gates for a memorial day today before resuming usual business on Saturday, but those plans were cancelled following discussions with police, who are still investigating the tragedy.

"My view is that when the families are happy with it and they're ready to move on (the park will reopen)," Mr Tate said.

Mourners hold a candlelight vigil for the victims. (Facebook)

Mr Davidson also sought to correct various media reports, including claims a Dreamworld employee had taken to social media to express concerns over the park’s safety.

"I was sickened as much as everyone else when I heard this story. This man is not an employee of Dreamworld," he said.

"We believe he was sub-contractor for a company who managed scaffolding for park refurbishment. He is not an engineer that has worked on rides."

He also said the ride’s operator on the fateful day was "experienced… with competency, experience and training to operate that ride."

Earlier, the father of Kate Goodchild and Luke Dorsett, who were killed in the accident, read a statement on the family's behalf.

Shayne Goodchild said his family was struggling to comprehend the tragedy.

"We want to know why our loved ones were taken away from us in such horrific circumstances," he said.