Crime Prevention Officer Mark Isherwood said that vehicles had been targeted on two streets overnight on Tuesday, March 2 and Wednesday, March 3.
Thieves targeted cars parked on Low Mill Road and Healy Road, Ossett, where they removed number plates from parked vehicles.
CPO Isherwood also encouraged people to make use of free anti-tamper number plate screws, which are designed to make it impossible to remove number plates without damaging them.
In an email, he said: "I just wanted to make you aware of a number of vehicles that were targeted by offenders for their number plates overnight between the 2nd and 3rd March in the Ossett area.
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"All plates were stolen overnight from the road sides on Low Mill Road and Healy Road.
"We do have a number of "anti-tamper" number plate screws available free of charge that we can send you for use on your vehicles. These screws cannot be removed when they have been screwed in, meaning a number plate can only be removed by snapping it, which in turn makes it no use to offenders.
"If you would like a pack of the anti-tamper number plate screws, please email [email protected] with your name and address and we will send some out to you in the post."