Four teenagers charged after drive-by shooting of Utai

New South Wales Police has charged four teenagers over the drive-by shooting of former NRL player Matt Utai and the alleged arson attacks targeting his family in Sydney.

Utai sustained gunshot wounds to his leg and shoulder during a drive-by shooting in Sydney suburb Greenacre on Tuesday.

A 16-year-old boy and a 19-year-old man have both been charged with "accessory after the fact to shoot at with intent to murder".

A 18-year-old and another 19-year-old have both been charged with damaging property by fire, while the latter was also charged with supplying prohibited drugs.

Utai, 44, remains in a serious condition after undergoing surgery for his injuries.

Police said the shots had been fired from a white SUV, which was later found burned out in nearby Wiley Park.

On Wednesday, police attended a further incident after shots were fired at a house in St Clair. A woman in her 50s was at home but was not injured.

A short time after they found a car on fire in Colyton and later the same day a house and vehicle were found ablaze in Guildford West.

New South Wales Police department said a task force was assembled to investigate the incidents - all of which are believed to have been targeting the same family.

On Thursday, police executed six search warrants - during which they seized three vehicles, 1kg of cocaine and knuckle dusters - and made four arrests.

The 16-year-old boy was refused bail and will appear at a children's court on Friday 20 February.

The two 19-year-old males were refused bail, while the 18-year-old man was granted conditional bail.

Utai played for Canterbury Bulldogs and Wests Tigers during his domestic rugby league career and won caps for New Zealand and Samoa.

Police say Utai is not suspected of any wrongdoing.