Four men were arrested on Saturday for allegedly trying to assault a man in Baulkham Hills.
Police were waiting in Cropley Road after being told the four men had earlier assaulted another man in Penrith.
The men aged between 27 to 23 were found in possession of baseball bats and knives.
They were all charged with robbery while armed with an offensive weapon and armed with intent to commit an offence.
Bail was refused and the four will face Parramatta Local Court on January 17.
Police are looking for thieves who broke into a Baulkham Hills house on January 8 and stole jewellery.
A lock on a rear door was forced open and the house was ransacked.
There were no witnesses.
A 21-year-old Cherrybrook man led police on a chase through Baulkham Hills on Friday and crashed into five cars on Windsor Road.
Police noticed the man at 7.45pm after he drove through a red light at the intersection of Old Northern and Windsor roads.
The P-plate driver was pulled over a short distance away but allegedly sped off after police got out of their car to approach the man's vehicle. A chase was terminated when police lost sight of the car.
Five minutes later the man crashed into an ambulance and three other cars before stopping in Marinda Road.
Police later arrested the driver and took him to Westmead Hospital where he is in a stable condition.
Two men have been charged with street racing after an unmarked police car clocked the drivers doing 30km/h over the speed limit on January 3.
Police allege the two men were stopped at a red light on Windsor Road, Kellyville, and accelerated rapidly up to 109km/h in a 60km/h speed zone.
The men were fined $799 and had their licences confiscated.
They will face Parramatta Local Court on February 4.
Fire ban breached
A Dural man was fined on Wednesday for breaching a total fire ban.
At 9am emergency services were called to a property on the Old Northern Road, Middle Dural, after reports of a fire.
Rural Fire Service volunteers extinguished the blaze while police spoke with a 57-year-old man at the property.
He was fined $1100 for lighting a fire during a total fire ban period.
Police are continuing to target bushfire arsonists. Residents are urged to assist police by reporting any suspicious behaviour.