Four men in their 20s have been killed and three people injured in a crash between a car and a mini-bus near Tullamore, Co Offaly.
It is understood the men were in a Honda Civic car that collided with the bus on the Tullamore to Geashill road at around 5.30pm.
The car containing the young men had apparently overtaken another car before colliding with the mini-bus.
Three people on the bus were taken to the Midland Regional Hospital in Tullamore. Their injuries are not believed to be life-threatening.
Gardaí and crash scene investigators described the crash as one of the worst they have ever had to deal with.
The road is currently closed and local diversions are in place.
Gardaí are appealing for witnesses to contact them at Tullamore Garda station on 057-9327600.