St John Ambulance volunteers treated three people for minor burns when a flare was ignited in the middle of a mosh pit at the Soundwave rock festival at Sydney Olympic Park.
But the organisation did not provide first aid to a young woman who was said to have suffered serious arm burns and was disfigured when the magnesium flare was set off during Bring Me The Horizons' set on Sunday night.
Soundwave fans suffer burns from flare
Three people are being treated for burns after a flare was lit during a set from British band Bring Me The Horizon at Soundwave music festival on Sunday.
Soundwave promoter AJ Maddah tweeted angrily on Sunday night about a young woman who he said was seriously injured when a flare was set off, and urged festival-goers to try to identify the culprit.
"Dear piece of sh*t who lit the flare in BMTH pit: Tonight you seriously burned and disfigured a young girl. I hope you f***ing get yours," he wrote.
"Poor little thing is really hurt. Massive awful burn on her forearm. I am devastated for her. :(
"If you see anyone with a lit flare please take their photo and tweet to me so I can hand to police.
"If anyone can correctly identify this son of a bitch I will shower you with so much tickets, backstage and cash you wont know what to do.
"If we catch anyone w/ flares you'll not only be evicted/arrested, I'll dedicate every iota of energy & money I can muster to ruin your life."
He later tweeted: "Thank you twitterverse we now have images of this jerk from multiple angles. Hopefully we can post asap and get him identified."
Superintendent Brent Murray, The St John Ambulance Australia event commander at Soundwave, said three people sought treatment after a flare was set off, but none of the patients matched the injuries described by Mr Maddah.
"St John members treated over 940 patients overall at Soundwave. Three of those patients we attended to as a result of some burns from a flare that was released at one of the stages," he said.
"The three patrons affected by the flare received minor burns from the flare and were all treated at the first aid post for those minor burns, and all released back to the event."
He said the trio - believed to be a woman and two men - were not taken to hospital.
A NSW Ambulance spokeswoman said paramedics did not treat a woman for burns at Soundwave.
Police confirmed that three people were treated for burns after a flare was fired near stage three. Officers will examine footage and photographs of the incident captured by festival-goers and posted online to identify the culprits.
Reports from those at the concert suggest that three flares were actually lit during Soundwave, one during the Metallica set - where about 40,000 people were watching the heavy metal band - and two during the Bring Me The Horizon set on stage three, a small stage outside the main stadium with an audience of about 800 people.
According to Twitter user @DanielTome, the person who lit a flare at the Metallica stage was hosed down.
On Twitter there have also been reports that one of the flare incidents occurred when a reveller let off a flare while sitting on someone's shoulders. The flare hit something above and dropped back into the crowd.
Police were unable to confirm how many flares were ignited.
More than 200 police officers patrolled the festival, which attracted more than 75,000 revellers on Sunday.
Police identified 54 people allegedly in possession of illicit drugs, including cannabis, ecstasy, ice, and amphetamines.
Throughout the day, 82 revellers were ejected from the event by police and security staff, many for being intoxicated.
Acting Assistant Commissioner Peter Lennon said that the majority of the crowd was well behaved.
"Large crowds descended on Olympic Park to see their favourite bands and an overwhelming majority of the 75,252 people in attendance behaved responsibly, but there were a small number who let the rest down," he said.
Soundwave and Mr Maddah have been contacted for comment.