All received a formal warning, but two “will be receiving infringement notices for discharging fireworks in a public place”.
One witness described last night as “a warzone for a bit” with fireworks constantly going off.
He said people were standing on flat roofs, shooting fireworks at people being chased by police.
Multiple couches burned and people threw fireworks in the flames, causing explosions.
The antics went on past midnight.
It follows fireworks being aimed at police officers on Sunday night after emergency services responded to reports of a large group setting off fireworks on Castle St about 9.30pm.
Senior Sergeant Anthony Bond said witnesses reported about 50 people shooting fireworks at each other.
“When officers arrived, they verbally warned everyone involved,” Bond said.
A 20-year-old man was arrested for being disorderly and released with a verbal warning.
However, as officers were returning to their patrol vehicle, a group of males deliberately shot fireworks in their direction, narrowly missing the officers.
“As a result of that reckless behaviour, another 20-year-old was held in custody overnight and released this morning with a warning,” Bond said.
“Fireworks are explosives and can cause serious injuries, which is why the sale timeframe for them continues to be reduced each year.
“Shooting fireworks at people or property is a dangerous decision that could have lifelong consequences. We want people to enjoy themselves safely, but we will take action if anyone is putting themselves or others at risk.”
Bond said police continued to urge the public to use fireworks responsibly.