South Wales Police is investigating a road traffic collision which occurred at around 1am this morning (Thursday July 7) on New Road, Rumney.
PS Geraint Bruford said:
"The single vehicle collision involved a white Peugeot Partner van containing two occupants.
"The van left the carriageway on New Road where it collided with a tree.
"A 19 year-old man and a 16 year-old boy were taken to University Hospital Wales with life-threatening injuries.
"The road was closed for a number of hours whilst investigation work was carried out.
"We would like to hear from anyone who witnessed the collision or from anyone who saw the manner in which white Peugeot Partner was being driven prior to the incident and from anyone with dash cam footage."