Fans 'stunned' as flares thrown in Perth music festival crowd

Music fans are "stunned" and workers are angry after flares were thrown at an outdoor music festival in Perth.

A flare ignited at the back of the Belvoir Amphitheatre last night, forcing shocked dancers the Touch Bass festival to dive for cover.

A thrown flare then landed on the stage.

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"We were just watching this set and saw this bright light behind us, could feel the heat and knew straight away it was a flare but we were all a little stunned," festivalgoer Kaitlyn Paton said.

"I honestly thought when it was thrown that somebody was literally on fire because the flame just got bigger."

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The stunt happened about 7pm and while organisers threatened to stop the event, it continued.

It's unclear if the woman responsible was spoken to, but the incident has not been reported to WA Police.

The incident has angered workers.

"People just freaked out and didn't know what to do, even the security guy that was up front of house, he just froze and was like 'what do I do?'" said Lachlan Barrett, who was working at the event.

"It's just a massive safety issue, you know. It's this big red hot thing that can melt through anything, it can burn people's hands."