An 18-year-old driver from Zebbug, Gozo, was critically injured last night when his Honda Civic slammed into a wall and rolled over in Xlendi Road, Fontana.
The incident happened at about 12.30am.
A 16-year-old girl who was a passenger was seriously injured while another two passengers, both boys aged 16 and 17, were slightly injured. All are from Xaghra.
The car was extensively damaged and rescuers needed to be called to pull some of them out of the wreckage.
A Magisterial inquiry is under way.