The single car collision happened around 10pm last night
Gardaí are appealing for witnesses following a collision in Kildare, last night.
Four people have been taken to hospitals in Portlaoise and Dublin for treatment.
The single-car collision happened at around 10pm on the Rathangan Road in Monasterevin.
A male in his teens, is believed to have suffered serious injuries, and was taken to Tallaght University Hospital.
A man and two women, all in their late teens, were taken to Midlands Regional Hospital Portlaoise, and treated for injuries.
A technical examination of the road was carried out, but has since reopened.
Gardaí are appeaing for witnesses to come forward, with particular interest in dash-cam footage of the area, at the time.
Anyone with information is asked contact Kildare Garda Station 045 527 730, the Garda Confidential Line on 1800 666 111, or any Garda Station.