Lincolnshire Police are appealing for witnesses after a man was beaten with a metal bar.
The assault happened at a property on Beck Bank, Quadring Fen near Spalding, at around 9.40pm on Tuesday, February 21.
A 55-year-old man was injured in the attack.
Police issued CCTV pictures of people wanted in connection with the assault on March 11.
Anyone who may have seen a vehicle leaving the area, or who has any information about the incident, is asked to contact Detective Constable Steve Nesbit at Spalding CID by calling 101 and quoting incident number 445 of February 21.