Police are appealing for information in relation to an aggravated break-in at Dural.
About 2am on Sunday a woman, 22, and a man, 28, were in bed at home in Kenthurst Road when three men smashed open the front glass doors.
Police were told two were armed with a machete and a handgun and all had their heads covered with balaclavas, some with skulls on them.
The men confronted the couple, took mobile phones, cash and the woman's handbag, tied the couple up with cable ties in the living room and fled.
The couple freed themselves and called police.
Anyone who saw or heard anything unusual or suspicious is urged to call Crime Stoppers on 1800 333 000.
IN OTHER POLICE NEWS:
A teenager has been charged with deliberately lighting the fire that caused evacuations in Northmead on Sunday.
Emergency services were called to Backhousia Reserve about 1.30pm, where a fire was burning between Greygum Terrace and Edison Parade.
Parramatta police evacuated 12 to 15 residents from homes nearby as a precaution.
The fire was contained about 3pm and residents were allowed home.
A boy, 15, was arrested at a home in Winston Hills and later charged with intentionally causing a fire and being reckless as to its spread.
He was conditionally bailed to appear in court on December 2.
Taxi driver hurt
A taxi driver was assaulted by fare-evaders at Castle Hill on Sunday.
Police say the driver, 45, of Rockdale, picked up five men from Market Street, Sydney, about 2.35am on Sunday and they asked to be driven to Castle Hill.
When the driver stopped at Pennant Street, Castle Hill — about 50 metres from the police station — the men ran off without paying their $150 fare.
The driver looked for the men and found them in Castle Hill Public School and says when he asked them for the money they punched and kicked him.
He told police that when he returned to his cab, they threw a large brick through its front window.
The men were described as aged 20 to 25. One had long brown plaited hair, one had very short hair.
Car break-ins rife
The Hills crime manager Detective Inspector Gary Bailey said he was disappointed to report 12 thefts from motor vehicles in four days — including nine in Baulkham Hills.
In Baulkham Hills, cars were broken into in Buckingham Road and Kiah Place on Thursday; and in Jasper Road, Burrell Crescent, Katherine Road, Conie Avenue and Victoria Avenue on Friday.
On Saturday and Sunday evening, cars were also broken into in Cecil Avenue and Greenvale Place, Castle Hill and Wrights Road, Kellyville.
Detective Inspector Bailey said at least two car owners left their cars unlocked.
Coins, credit cards, sunglasses and tools were among the items stolen.