The accident happened on the Rathdowney to Abbeyleix Road at around 3:00am this morning at Middlemount, (Ballyvoghlaun R433) latter approximately 3 kilometres from Rathdowney.
Gardaí reports state that the vehicle in which they were travelling collided with a roadside sign, which lead to a 20-year-old male driver and two women, aged 20 and 35 years, all being pronounced dead at the scene. The bodies of the deceased have been removed to Portlaoise Hospital.
A fourth person; a 16 year old boy passenger in the car was rushed to Tullamore General Hospital where his injuries this morning thankfully are described as non life threatening.
The road is expected to remain closed until lunchtime today to allow Garda Forensic Collision Investigators carry out necessary inspections.
Any witnesses are being asked to contact Portlaoise Garda Station on Tel: 057-8674100, or on the Garda Confidential Telephone Line on 1800-666-111, or any Garda Station.
Go ndéana Dia trócaire ar a anam dílis.