Soccer fans brawl in Melbourne

Flares have been ignited at a Melbourne stadium hours after four people were injured in a violent brawl between soccer fans.

Fans light up a flare during the Round 12 A-League match between Melbourne Victory and the Western Sydney Wanderers at AAMI Park in Melbourne. (AAP)

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Police in Melbourne are reviewing CCTV images of a brawl between soccer fans ahead of the game between Melbourne Victory and Western Sydney Wanderers.

Fans say flares were set off and some took to Twitter to express their concern after hearing at least five explosions at AAMI Stadium late in second half.

Kacey Lam tweeted a photo of the thick orange smoke, saying: "SIX LOUD BANGS. Anyone would think terrorists have overtaken AAMI."

Police say four people were injured in a scuffle yesterday afternoon outside the Royal Melbourne Hotel on Bourke Street with groups of rival fans set off flares, broke chairs and glasses and threw sticks.