Four injured in two-car crash in Sydney

Four people are injured and two are in a serious condition after a two-car crash in Sydney's west.

The collision happened at Seven Hills just before 11pm on Saturday, leaving the male driver with head and leg injuries and a female passenger with abdominal injuries, both were taken to Westmead Hospital in a serious condition.

A second female passenger was also taken to hospital with minor injuries.

The other driver, a woman in her 60s, received a broken ankle and neck injuries and was taken to hospital in a stable condition.