A man is in hospital with serious injuries after he was attacked in a Lincoln home with a hammer.
Three people have been arrested and investigators are seeking a fourth.
Police were called to a reported robbery on Southdown in Bracebridge Low Fields at around 10.55pm on Wednesday, August 7.
Officers found a 50-year-old man with serious injuries to his abdomen and head.
Lincolnshire Police believe that a claw hammer was used in this attack which has been recovered.
The victim was taken to QMC.
Three other people were present at the property and were arrested – a man in his 40s, a woman in her 40s and a woman in her 50s.
A force spokesperson said: “Officers are seeking one other person in relation to this incident.
“A scene guard remains in place and an investigation is underway.”
Anyone who saw or heard anything should call 101 quoting incident number 561 of August 7.