Four men stabbed in Sydney street fight

A man remains under police guard in hospital after two people were stabbed in the neck during a fight outside a pub in Sydney's west.

Police say a knife was pulled out during an altercation between two men and three security guards outside a licensed premises in Smithfield about 10.15pm on Friday.

Two men in their 40s were treated at the scene for wounds to their necks while a third man, aged 45, was taken to Westmead Hospital after his head was stabbed.

A fourth man had minor injuries to his hand.

A 44-year-old man arrested has not been charged but remains under police guard at hospital.