A man in his 30s was taken to hospital in the early hours of Sunday morning with injuries likely to have been caused by a blade.
The attack took place on Prince Alfred Avenue in Skegness on Sunday, March 25, and was reported to police at 12.45am.
A Lincolnshire Police spokesperson said officers put pressure on the wound of the man, who was taken to Boston Pilgrim Hospital “with an injury consistent with what a blade may cause”.
“There is no confirmation of what weapon was used”.
Paramedics later praised the actions of the police officers.
Anyone with any information on the incident should contact police quoting incident number 17 of March 25.
It can also be reported anonymously to Crimestoppers on 0800 555111.