A suspected machete brawl has erupted outside a community sports event as police slam young thugs and the premier insists the state is safe.

A large group of youths, believed to be armed with machetes, got into a fight after NRL Victoria's Harmony Cup at Broadmeadows in Melbourne's outer north on Saturday night.

A 19-year-old man was found near Seabrook Reserve with serious stab wounds to his torso.

Detective Sergeant Matthew Feben said up to 1000 people were dispersing from the community rugby league event when the fight broke out.

"It was quite heavily populated in the area at the time," he told reporters on Sunday.

"There was a large group leaving the area.

"Police are investigating the possibility they may have been in attendance at that event."

Offenders were described in an in

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