The Falls Festival in Lorne, Victoria has been cancelled due to extreme weather conditions forecast for tomorrow.
About 9000 punters are already staying on-site, with the festival officially opening its gates yesterday.
The Marion Bay, Byron Bay and Fremantle iterations of the festival are still going ahead.
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Falls organisers posted a lengthy explanation for the cancellation on Facebook on Sunday morning.
"It is with a heavy heart we have had to cancel the remaining days of The Falls Festival in Lorne due to the predicted extreme weather conditions forecast for Monday December 30th in the Otways and surrounding region, creating a risk to health and safety due to potential fires, smoke, severe winds and tree hazards," the post begun.
"The decision has not been made lightly, our patron and staff safety is our priority.
"Forecasted conditions have gotten significantly worse in the past 12 hours, with information coming to light that has not been available to us before the event kicked off on December 28th.
"After consultation with local and regional fire authorities and other emergency stakeholders, it is clear that we have no other option. While conditions are fine at time of writing, we are taking the opportunity to move everyone offsite safely and in good time."
Organisers have asked those already on the festival grounds to pack up their campsites and leave.
Ticket-holders will receive a full refund.
Meanwhile, Tasmania Police has released a statement ahead of the beginning of the Marion Bay Falls Festival today, urging punters to "have fun and stay safe".
Senior Sergeant Brenda Orr said there would be a high police presence on the festival site over the next few days, including uniformed and plain-clothes police, licencing and forensic officers and criminal and drug investigation officers with drug detection dogs.
"The risk of anti-social behaviour is higher when a large group of people gather for a music festival, particularly when alcohol or drugs are consumed," Senior Sergeant Orr said. "I urge anyone drinking alcohol to do so responsibly."
"Police want everyone to enjoy the festival and this means being safe and respectful to others, especially when in close proximity in confined areas such as the mosh pit.