Two break-and-enters were attempted in Buckingham and Palace roads in Baulkham Hills early Friday morning.
The first attempted break-in occurred in Palace Road at about 4am.
The resident, a 58-year-old woman, was woken by sounds from outside her front door.
She told police she then switched on her front door light, looked out a window and saw a man walking away across her front yard.
At 5.35am in Buckingham Road, a 42-year-old woman said she saw a man outside her rear window.
She told police she screamed and he ran away.
He was described as tall, with black hair and wearing a tracksuit and black pants with white stripes.
Anyone with any information on the two incidents is urged to contact
The Hills police on 9680 5399 or Crime Stoppers on 1800 333 000.
A man who refused to be breath-tested faces court on an automatic high-range drink driving charge, after being stopped in Dural on Saturday.
At about 12.40am police stopped his vehicle for a random breath test.
Police said the man, 19, of Galston, breathed into the apparatus seven times before recording a result.
They later attempted a more accurate alcohol reading at the police station, but the man refused to co-operate.
Police said the law deemed anyone refusing an alcohol reading to be a high-range drink driver.
Vandals broke into a Castle Hill home and caused an estimated $3500 worth of damage, sometime between June 13 and June 20.
The home, which had no one staying in it over that period, is in Kentwell Avenue.
Police said the vandals gained entry by smashing a front ground-floor window.
They then wrote graffiti across some inside walls, kicked in wardrobe doors and burnt some of the carpet.
Contact Hills detectives on 9680 5399 or Crime Stoppers.
A car rolled for a distance after it collided with another car in West Pennant Hills on Thursday.
At about 5.15pm a 71-year-old man was driving along Castle Hill Road near the corner of County Drive.
He attempted to turn right into a private driveway, when another car, driven by a 66-year-old woman, clipped the side of his vehicle and rolled until it landed on its wheels.
The woman told police she had swerved her car to avoid a rear-end collision with the man’s vehicle.
Police are still investigating.