A firearm has been found during a technical examination of the car that is believed to have been used by the gang who attacked a couple in their home near Ballincollig, Co Cork, early yesterday morning.
The firearm has been sent for further examination.
Meanwhile, Assistant State Pathologist Dr Margot Bolster has carried out a post-mortem examination on the body of 35-year old Mikolaj Wilk, who died following the attack.
Gardaí say he died of multiple injuries, but would not give details on the type of injuries he suffered. However, gardaí say that the injuries included stab wounds.
Mr Wilk's wife, Elzbieta, is still being treated in hospital, after the couple were violently assaulted by a gang of three or four men in the early hours of Sunday.
She had surgery on her hand today, having sustained face and hand injuries in the attack.
Mr Wilk was a Polish national who had settled with his wife at Maglin on the outskirts of Ballincollig.
He ran a garden maintenance company and was well known in the area.
The couple have two children under the age of six. They were uninjured in the attack. Their grandfather and aunt are understood to be on their way from Poland.
Another woman, aged in her 30s, was also in the bungalow at the time of the attack and escaped through a window. She was also not injured in the attack.
The family were at home when the gang entered the house shortly after 3am yesterday and attacked both parents with a weapon. Mr Wilk died later in hospital.
Investigating gardaí have re-issued their appeal for information.
They resumed door-to-door inquiries this morning, while a forensic examination of the couple's home is also ongoing.
Fr Piotr Galus, chaplain to the polish community in Cork, confirmed a special mass will be held in the city on Wednesday night, and in Ballincollig on Saturday evening.
Additional reporting: Paschal Sheehy