Police are appealing for information after a serious assault in the early hours of Monday morning.
Officers think the assault occurred in St Peter's Square off Seel Street at about 4am.
At about 4.30am a 30-year-old man went to the Royal Liverpool University Hospital with injuries thought to have been caused by a sharp object. The victim is undergoing surgery and is in a critical condition.
It is believed the victim was assault by a group of men.
The area around St Peter's Square and Seel Street has been cordoned off for forensic examination. Officers are checking CCTV from the nearby area and have stepped up patrols in the area.
Detective Inspector Andy Ephgrave, said: "This was an extremely serious assault which has left a man in a critical condition.
"This happened in a busy part of the city centre and I understand people may be concerned but I want to reassure them that incidents such as this are, thankfully, rare and we are doing everything we can to bring the people responsible to justice.
"I would appeal to anyone who was in the area at the time and saw the incident or anything suspicious to call police as you might have really important information for our enquiries."
Anyone with information should call police on 0151 777 4064 or Crimestoppers, anonymously, on 0800 555 111.
More top news
Heavy rain pushes eastwards across the region on Sunday evening followed by further outbreaks of rain on Sunday night. 60mph gusts possible
The Met Office have named the 9th storm of the season Storm Imogen. This will cause strong winds for a time across the NW
Thousands are expected across the North West to welcome in the year of the Monkey.