Police were called to Christine Crescent in Lalor Park at 4.45pm, where they found the pair, both believed to be in their 40s, with stab wounds.

The woman had wounds to her back and was in a serious condition, while the man had wounds to his shoulder.

Both were taken to Westmead Hospital, where they remained in a stable condition on Thursday evening.

Officers set up a crime scene on Christine Crescent, blocking off some of the road as the stabbing was investigated.

A NSW Police spokeswoman said police would be speaking to the injured parties to establish a chain of events leading up to their injuries.

Anyone with information is urged to come forward to police in Blacktown Local Area Command, or call Crime Stoppers on 1800 333 000.

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