Couple threatened with knife during Sydney home invasion

A couple have been threatened with knives following a home invasion in Sydney's west overnight.

Police believe three armed men stormed into the home on Carriage Street in Austral just after 10pm.

The men threatened a 29-year-old man and a 28-year-old woman – before stealing jewellery and leaving.

The pair were not injured.

A crime scene has been established as police investigate the circumstances surrounding the incident.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.