A 21-year-old man suffered a broken jaw and lost several teeth when he was punched by two men in a Blackpool bar, say police.
The attack happened at around 11.30pm on January 28 at Scrooges Wine Bar in Milbourne Street.
The man was taken by ambulance to Blackpool Victoria Hospital where he received "extensive treatment".
Police have now released CCTV images in an attempt to identify two men they would like to speak to in connection with the incident.
PC Jeanette Ashurst, of Blackpool Police, said: “We are investigating a serious assault at a Blackpool bar which has left the victim requiring extensive treatment in hospital.
“We are particularly keen to identify these men, pictured, in connection with our enquiries.
“We believe someone must recognise these individuals and if you do I would urge you to contact us immediately.”
Anyone with information can contact police on 101 quoting crime reference WA1701498.
Alternatively, Crimestoppers can be contacted on 0800 555111 or online at www.crimestoppers-uk.org.