Tensions flared in Alice Springs as a violent brawl erupted, leaving onlookers in shock.

The chaotic scene unfolded in the heart of Alice Springs at 2:45am on Saturday with the escalating argument leading to an all-out melee involving a chair as a weapon.

After the brawl, several individuals involved barricaded themselves inside a nearby pizza shop, with one person reportedly grabbing a large kitchen knife, terrifying the shop staff.

The incident occurred just as Northern Territory Police Commissioner Jamie Chalker unexpectedly exited his position, with many police members uninformed until the government released a joint statement on Sunday morning.

WARNING The footage below contains images of strong violence.