Inspector Jonathan Francey said: “The one car collision involving a Fiat Grand Punto was reported at around 3.30am.
“Four teenage girls have been taken to hospital and it is believed the driver of the car, who is 19 years old, is currently in a critical condition.
We are appealing for witnesses or anyone who may have seen the vehicle travelling on the Ballycrochan between 3.15 am and 3.30 am this morning to please get in touch.
“We would also like to hear from anyone who may have captured dash-cam footage.
“Please call 101, quoting reference 371 16/06/19.”