A 31-year-old man has been charged after allegedly crashing into another car, killing two women, following an alleged crime spree in Sydney’s south west on Saturday.

It allegedly began with a car theft and assault about 10.20am on Saturday on King Georges Road, South Hurstville.

Police allege a 25-year-old man was punched in the face before his car was stolen by the offender at a petrol station in South Hurstville.

A police chase was sparked after the driver allegedly failed to stop when it was seen by highway patrol officers at Beverly Hills.

Assisted by the NSW Police air wing, police continued their pursuit along the M5 motorway before calling it off in Bankstown area about 10.30am.

A police helicopter continued to track the car for at least 40 minutes before it crashed into an Alfa Romeo sedan on the Old Hume Highway in Camden South about 11.10am.

“The offending driver has gone up the inside of those vehicles at speed, crossed into the intersection and impacted with another vehicle that had the lawful opportunity to turn right,”Assistant Commissioner Brett McFadden said.

A 60-year-old woman driving the Alfa Romeo and an 84-year-old woman passenger died at the scene.

The pair are part of an extended family.

“This is a tragic set of circumstances. This is absolutely devastating for that family,” Mr McFadden said.

The offender allegedly ran from the crash and was arrested at gunpoint nearby.

He was taken to Campbelltown Hospital for mandatory testing before being taken to Campbelltown Police Station where he was charged with eleven offences including two counts of dangerous driving occasioning death, driving recklessly, police pursuit, fail to stop and assist after vehicle impact causing death and driving without a license.

A critical incident team will lead investigations into the circumstances surrounding the crash.

The investigation will be reviewed by the Professional Standards Command and overseen by the Law Enforcement Conduct Commission.

– with AAP