Two killed after police pursuit

Two women are dead and a man earlier pursued by police critically injured following a head-on crash in Sydney's west.

Police said they had terminated their pursuit of the man's car prior to the crash on Windsor Road at Windsor about 8.30am (AEST) today.

"The two women in one of the cars died at the scene," police said in a statement.

"The sole occupant of the other car has been taken to hospital."

Several ambulances and two emergency helicopters were sent to the crash.

The Ambulance Service of NSW said the man had serious head injuries, limb injuries and suspected spinal injuries.

After being freed from the wreck, he was urgently transported to Nepean Hospital in a critical condition, the service said in a statement.

"Police from the Hawkesbury Local Area Command had terminated a pursuit with the man's car prior to the crash," police said.

An independent critical incident team has been formed to investigate all circumstances surrounding the crash.

Windsor Road is closed between Mulgrave Road and Macquarie Street while investigations take place. Diversions are in place.

Quote: Police always seem to say that they had terminated a pursuit prior a fatality however once the pursuit is on there is no one to inform anyone else that the pursuit is or has (as alleged here) been called off. These are the sad facts for innocent bystanders most everywhere. The cylonic weather conditions this weekend alone should have been the first question raised prior any police pursuit. How can anyone justify that?