It wasn't a happy new year for some Sydney revellers, with nearly 100 people charged by police for offences including drug supply, assault and offensive behaviour.
But police have praised the behaviour of the vast majority of the estimated 1.6 million people who descended on Sydney Harbour on Monday night to welcome in 2013 with a blaze of fireworks.
Assistant Commissioner Alan Clarke said more than 3000 police officers were scattered across the city for Operation Paramount and were generally pleased with the behaviour of revellers.
"Unfortunately, there are a small group whose behaviour gained police attention and led to criminal charges. It's not the best way to start 2013," he said.
"While there have been a few idiots trying to spoil the end of the evening for others, it is good to see most revellers celebrated within their limits, looked out for their mates and are heading home in good spirits."
He said 29 people were arrested and charged with drug offences during a drug-dog operation at Bondi Junction Railway Station on Monday.
At Woolloomooloo, two 22-year-old men were arrested for allegedly pointing a laser at a police helicopter. They were charged with threatening the safety of an aircraft and using a prohibited weapon.
In Dee Why, a Molotov cocktail was thrown outside the police station on St David Avenue, causing an explosion and a small fire at the rear of a police vehicle.
Officers inside the station heard the explosion and extinguished the fire. No one was injured and no property was damaged.
Police searched the surrounding streets with a sniffer dog but the offenders escaped.
Meantime, four men who were arrested during a brawl in Ingleburn were taken to hospital after the police vehicle they were being driven in crashed and rolled.
Police were driving the men in a caged vehicle to Macquarie Fields police station when the vehicle tipped on a roundabout and rolled.
Two police officers in the vehicle suffered minor cuts and bruises and were treated at Liverpool Hospital.
The four men in the rear of the vehicle also were taken to Liverpool Hospital where they were treated for minor injuries. They are expected to be charged over the brawl when they are released from hospital.
Meantime, more than 440 people were treated by St John's Ambulance volunteers and 370 people were treated by NSW Ambulance paramedics in Sydney on Monday for a range of injuries, including heat stroke, intoxication, sprains and broken bones.