Goods valued at more than $17,000 were stolen in two break-and-enters in Carlingford on Wednesday of last week.
The first, in Manildra Avenue, took place between 11.20am and 12.40pm.
The resident had left the premises for only a short time but returned home to find the front door open.
Police were called and discovered the thief, or thieves, gained entry by removing a flyscreen from a rear window.
A search established that rings, necklaces and earrings valued at more than $10,000 were missing.
The second robbery occurred in Snowdon Avenue between 12.45pm and 3.25pm.
A window was smashed and items worth more than $7000 including jewellery, cameras, laptops, guitars and a wristwatch were taken.
Castle Hill residents contacted police to report suspicious vehicles driving through the streets and large groups of people near the vehicles at different times during the night.
Most of the calls were made on Tuesday and Wednesday of last week.
Police investigated and found drugs in some of the vehicles and also booked some drivers for drink-driving.
‘‘Please be vigilant and report any suspicious activity,’’ a spokesman for The Hills police said.
On Friday $4000 in cash and a wristwatch were stolen from a North Rocks home.
The robbery occurred in a duplex house in The Carriageway between 8am and 5pm.
The thief, or thieves, took $2000 in cash and a wristwatch valued at the same amount.
Police say they do not yet know how entry was gained, nor were there any witnesses to anything unusual.
They urged anyone with any information to contact Hills detectives on 9680 5399 or Crime Stoppers on 1800 333 000.
A man was injured after his car crashed into a power pole in Glenorie on Friday.
The accident occurred in Cattai Ridge Road at about 6pm.
The 39-year-old Rouse Hill man was trapped in his vehicle and had to be freed by emergency services, who treated him at the scene and later took him to Westmead Hospital.
He sustained leg injuries but was reported to be in a stable condition.
No one else was involved in the crash.
Police investigations are continuing.
Four cars were involved in a multiple collision in Baulkham Hills on Friday.
At about 8.45am in Old Windsor Road, a car driven by a 29-year-old Glenwood man ran into the rear of another car as it neared Seven Hills Road.
That vehicle was propelled into the back of another car, which in turn crashed into a fourth car just in front of it.
The driver of the first car was slightly injured in the crash and his vehicle had to be towed away.
No one else was hurt.
Police are investigating and said charges of negligent driving may be laid.
On Friday a Kellyville motorist returned a positive reading from a roadside breath test, but still got to drive her car home.
The 53-year-old woman was stopped for the breath test in Greens Road, Kellyville, at about 10.30pm.
She tested positive and had to undergo further breath analysis at Castle Hill police station. But at the station she returned a reading of 0.042; narrowly below the legal limit.
Police then drove her back to her car where she resumed her journey.
A thief broke into a Kellyville yard and stole aluminium pool fencing and windows, copper and flagpoles, between 3pm on Friday, June 20 and 6.30am the following Monday.
A witness said a man and a vehicle were in the yard on Friday.
The man was described as Caucasian in appearance, aged 25-30, of stocky build and with short brown hair.
The vehicle was described as a white tilt tray Isuzu truck with blue stripes on its side.
Call The Hills police on 9680 5399 or Crime Stoppers.