A critical incident investigation has been launched following the critical injury of a man at Newcastle Police Station today.

About 6.10pm (Thursday 3 March 2016), a 45-year-old man attended Newcastle Police Station.

While speaking to police, he produced a sharp object and began to injure himself.

The man was Tasered by police and restrained.

He has been taken to John Hunter Hospital for surgery and is now in a stable condition.

A critical incident team from Tuggerah Lakes Local Area Command will now investigate all circumstances surrounding the incident.

That investigation will be overseen by the Professional Standards Command.

No further details are available at this time.