Lancashire Police are looking to speak to four men as part of their investigation into a sexual offence which occurred during the early hours of Tuesday morning.
A police spokesman said: "Police wish to speak to speak to the males pictured as they are potential witnesses to the case.
"If you are either the persons pictured or you know them please make contact."
The image is from CCTV in The Strand area/Queen Street of Blackpool at 2.20am on Tuesday.
To help police in their investigation contact Blackpool CID on 01253 604153 or email firstname.lastname@example.org quoting log reference LC-20180624-0362.