Four people are being questioned by gardaí this afternoon in connection with the death of a Polish man in Limerick city over the weekend.
The 26-year-old victim was found with serious head injuries at a house in Briarfield, Castletroy, in the early hours of Monday morning and died later in hospital.
He had been at a house party when he was found at the bottom of a stairs by friends.
A postmortem showed he died as a result of an assault.
Three men and a woman were arrested at various locations in Limerick city early this morning in connection with the investigation.