After reports that a stink bomb was found in a ballot box, Kent Police confirmed they are investigating.
A spokeswoman said two vials containing an unknown liquid were found in the Beacon Hill in Herne Bay.
Tests will be carried out on the substance.
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At least two intruders broke into the property and shot Mr Hedger in the early hours of Sunday morning.
Sunday evening's weather for the east
Sunday evening's weather for the west