Gardaí are still waiting to interview the driver of a Northern Ireland-registered BMW car involved in a fatal crash on the N21 near Castleisland, Co Kerry, on Sunday morning.
Two Polish motorcyclists in their 20s, returning to their ferry at Dublin from a Harley-Davidson rally in Killarney, were killed when their bikes collided with a car coming in the opposite direction near a slight bend at about 6am on Sunday.
Gardaí described the accident as one of the worst scenes they and emergency personnel had ever encountered. The two men died instantly. The BMW driver, who is from the Knocknagoshel area, remains in a stable condition at Kerry General Hospital in Tralee. His injuries are thought not to be life-threatening.
A spokeswoman for the Polish embassy said it had contacted the victims' families and arrangements were being made to repatriate the bodies. The victims' names have not been released.
Meanwhile, Gardaí have named two men who were killed in separate road crashes at the weekend. Rod Finch (62), Doocastle, Co Sligo, died when the motorbike he was driving collided with a car at Woodbrook, Carrick-on-Shannon, shortly after midday on Sunday. The woman driver of the car suffered minor injuries.
On Saturday, James Maher (25), St Ann's, Athlone, Co Westmeath, was killed when the car he was driving crashed through a ditch and ended up in a field near Strattonstown, Ballina, 12km from Mullingar.
He was alone in the car when the crash happened and no other vehicles were involved.