Two police officers have been taken off operational duty while the Independent Police Complaints Commission investigates how they dealt with a pensioner who was stopped for not wearing his seat belt.
The 70-year-old complained they smashed his car and kicked his windscreen.
Earlier the motorist had driven away after being pulled over for not wearing a seatbelt.
A spokesman for Gwent Police said the matter would be thoroughly investigated.
via bbc.co.uk