Investigators in Upper Makefield Township say the signs were placed there without the homeowner's permission.
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Police posted pictures that show the razor blades taped to the side of the signs.
"When the resident went to remove the Shapiro sign from their property they were cut by the razor blades placed around the perimeter of the sign. Obviously, this was designed to inflict punishment on anyone who attempted to remove the sign. We were contacted later and upon inspecting all the campaign signs, officers found that a Fetterman campaign sign and an Ehasz campaign sign also had razor blades placed around the perimeter of the sign. These signs were removed by the officers," said the Upper Makefield Township Police Department on Facebook.
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At least one resident suffered injuries to their hand.
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The department asks anyone who found signs placed on their property without permission to inspect them before they remove them.
Anyone with information on this case is asked to call Upper Makefield police.