A driver has been blinded after a bottle struck his windscreen.
The incident, which occurred on the B4598 near Abergavenny on Wednesday night, has left the driver blind in one eye and his passenger severely shaken.
Gwent Police found a hole in the windscreen and broken glass from the bottle inside the Volkswagen Passat, where it had struck the windscreen and gone into the car.
According to the South Wales Argus, both driver and passenger had to be admitted to Nevill Hall Hospital in Abergavenny for treatment, with the driver remaining in hospital for six days.
Doctors have said he will never regain 100 per cent sight in his right eye. The passenger was reported to have sustained cuts to both of his eyes.
Gwent Police have suspicions the bottle may have been thrown by a motorist in a passing car, but are keeping "an open mind".
Detective constable Rosie Vincent told the South Wales Argus: "This really is a shocking incident and has obviously had a devastating impact on the victims.
"We need anyone who may have been in the area at the time to come forward. They may have seen items being thrown from another car window or another vehicle driving erratically in the area.
"We're treating this as an assault at the moment and it demonstrates just how dangerous throwing items out of a vehicle can be – whether it be with the intent of hitting someone/another vehicle or not."
Witnesses or anyone with any information are asked to contact Gwent Police on 101 or Crimestoppers anonymously on 0800 555 111.