South Wales Police are investigating a spate of unusual and "extremely dangerous" thefts of fuel from vehicles in recent weeks.
Thieves go underneath the vehicle to drill into the fuel tank and drain off what is inside.
A power tool is used to bore into the tank - risking sparks and igniting the fuel within.
Three incidents took place in and around the Rhydyfelin area of Pontypridd on the night of February 5th.
It follows similar thefts in Merthyr in the last fortnight.