A 19-year-old man has suffered serious head and facial injuries after being assaulted in Kirton.
Police are appealing for witnesses to the attack on London Road near the Black Bull pub at around 11pm on Saturday, August 5.
Investigating officers believe a large group in the vicinity may have witnessed the assault.
Anyone with information should get in touch with Detective Constable Chris Lill from Boston CID on 101, quoting incident number 84 of August 6.
Alternatively, contact the independent charity Crimestoppers anonymously on 0800 555 111.