The front part of the car was slightly damaged in the stone attack, but none was injured, police said.
Panneerselvam, who has revolted against the leadership of ruling AIADMK, was proceeding to nearby Andipatti in the district, his native, when the incident occurred, they said.
Panneerselvam was here to participate in various functions organised by his supporters.
Police said they were searching for the miscreants who pelted stones.
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