A Molotov cocktail was lobbed by a man in front of the Raj Bhavan's main gate on Wednesday, police said.
The man who threw the petrol bomb was immediately overpowered, they said. A senior police official said the accused is being questioned for the motive in hurling the petrol bomb.
A Molotov cocktail is an incendiary device, usually filled with petrol and a piece of cloth is used as a wick to light it.
The BJP's state unit president K Annamalai alleged the incident "reflects the true law and order situation in Tamil Nadu."
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