Four vehicles parked on Bedwellty Road, Cefn Fforest, have been scratched.
Police are appealing for information after the criminal damage happened overnight between Saturday, February 6 and Sunday, February 7.
The vehicles were a Jaguar XF, Citroen C3, BMW 525 and a Ford Transit Van.
Anyone with information can call Gwent Police on 101 quoting log 268 07/02/16.