Police have released images of a man they want to speak to following a double stabbing in a busy city centre.
Witnesses described seeing two men lying on the floor after they were stabbed during an argument outside a bar.
Staff from Yates' Wine Lodge near Liverpool's Queen Square bus station were among the people to help the victims who were taken to hospital.
Detective Inspector Gavin Mulcahy said: "We simply will not tolerate such violence in our city centre."
One man said he saw the two men lying on the floor and a group of up to 15 people crowded around them.
He said they were both taken to hospital in separate ambulances.
It happened at about 7.35pm on Friday 17 June.
Both men remain in hospital in a serious but stable condition.
An investigation has been launched to find the suspect, who is reported to have escaped on foot towards Lime Street station.
Detective Inspector Chris Saidi said: "Our officers have been working to find the person responsible for an appalling incident last night which has left two men hospitalised.
"If you recognise the man pictured then please get in touch as we believe he may have information that could prove vital to our ongoing enquiries.
"We believe this to be a targeted attack and we would like to reassure anyone planning on heading into Liverpool City Centre this evening to enjoy a Saturday night out that there is no wider threat to the community."
Anyone with information can send a direct message to police on Twitter or Facebook quoting reference 22000361428.The independent charity Crimestoppers receives anonymous information online or on 0800 555 111.
Video for police can be uploaded at the NICE website.