Two investigations were launched by the Health and Safety Authority (HSA) following the tragic deaths of two young men in separate work-related accidents.
Damien 'Fordie' Forde (25), from Burnfort, Knockbrack, Co Cork, died when the tractor he was travelling in struck a ditch shortly after midnight on Thursday morning.
Separately, a young man was killed in a quarry accident in Co Mayo. The victim has been named locally as Joseph (Joe) Harrington (27) from the townland of Sonnagh, Charlestown.
Elsewhere, tributes continue to pour in for Alan Harris, who was killed after he was overcome by toxic methane fumes while working in a sewer in north Dublin on Wednesday.
Meanwhile, the grief-stricken wife of Alan Harris, Tracy, took to Facebook to pay tribute to her husband - her "best friend and soul mate" - and ask people to pray for the man who tried to save him.
Alan (45), who is the owner of Drain Tech, and his brother Steve (32) were called to the Drumnigh Wood estate in Portmarnock after residents complained of a smell. The HSA is investigating.
Steve remained in a critical condition in Beaumont hospital last night after trying to save his brother. The men are cousins of Ireland soccer star Robbie Keane.
"My heart has been shattered into a million pieces," wrote Tracy. mother of his two adult children. "Please send your prayers to his brother Steve who is still fighting for his life after trying to save Alan's one."