A security guard is in hospital with facial fractures and head injuries after he was allegedly attacked at a bar in Sydney's CBD in the early hours of Australia Day, police say.
Police are questioning two men, aged in their early 20s, over the assault at the bar, on the corner of Pitt and Goulburn streets, about 3am on Tuesday.
Officers who arrived at the bar were told that security guards had stopped the two men from entering a part of the bar because of potential overcrowding issues. 
A short time later a scuffle broke out, during which the male security guard was punched in the face and fell to the ground. He was understood to be bleeding heavily from his face when police and paramedics arrived.
Paramedics treated the security guard at the scene before taking him to hospital, where he was treated for multiple facial fractures and head injuries. Police said he was understood to be in a serious but stable condition.
The two men were arrested at the bar and taken to Day Street Police Station in the city, where they were being questioned over the incident early on Tuesday morning. No charges have been laid.
Police have urged anyone with information about the alleged attack to contact Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page.
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