Festival organisers are reviewing their security arrangements after three flares were lit at Sydney's Soundwave music event, causing injuries and panic among revellers.
Police say it's lucky no-one was killed during the gig at Olympic Park, where lit magnesium flares - which can reach temperatures over 1000C - were thrown across a packed moshpit and onto the stage.
"We can see that people were injured and the outcome could have been far more dramatic," assistant police commissioner Alan Clarke told reporters on Monday.
"If that had resulted in a crowd crush - a crowd stampede - we could have had fatal consequences."
Clarke said police are now working with festival organisers to review security measures, including an investigation into how the flares were smuggled into the Sunday night event.
Soundwave festivals are due to be held in Melbourne on March 1, in Adelaide on March and in Perth on March 4.
Festival promoter AJ Maddah condemned the flare thrower or throwers and suggested he'd obtained images identifying those responsible.
But claims made by Maddah on Twitter that a female reveller was "seriously burned" and "disfigured" by a flare appear incorrect.
The Ambulance Service of NSW did not treat anyone for serious burns at the event, although St John Ambulance staff did treat three people for minor burns and dozens of others for minor injuries and exhaustion.
One woman posted pictures of her injuries online and said she was hit by a flare.
"I'm not disfigured guys, there's just a small hole in my shoulder - gosh," the Newcastle resident wrote on the photo sharing site Tumblr.
She posted two pictures showing reddened skin and a bloodied gash about one centimetre wide.
The woman, who did not post her name on the site, described being hit by the flare during a performance by British band Bring Me The Horizon.
"Someone decided to let off a flare in the middle of the mosh - that was all well and good, as I was one person away from the barrier.
"Until someone decided to throw one towards the stage, this just happening to hit me on the shoulder.
"I was then pushed to the ground by the crowd, almost landing on the damn flare."
She described being shoved up against a security barrier before being rescued and taken for treatment.
She went to Belmont hospital, near Newcastle, for several stitches.
Dramatic footage of a flare being lit at the festival was posted to YouTube.
The video shows the flare burning on top of the stage before falling into the crowd.