UPDATE: The man has now been identified.

POLICE investigating a serious assault in Royston that left a man with life-threatening injuries have released CCTV of a man they want to speak to.

Emergency services were called at around 5.05pm on February 22 following reports a man had been assaulted in the Milgate Street area.

The man was taken to hospital with life-threatening injuries where he remains in a critical but stable condition.

A 28-year-old man arrested on suspicion of assault, possession of Class A drugs and driving offences has been released under investigation.

Police believe the man pictured could hold vital information and are appealing for anyone who recognises him, or anyone who witnessed the assault, to get in touch.

Anyone with information should call 101 quoting incident number 692 of February 22 2018.

Information can also be passed to Crimestoppers anonymously by calling 0800 555 111.