Some activists belonging to apro-Tamil outift allegedly threw a burning wooden log inside the premises of the Income Tax office in Salem on Wednesday, protesting external affairs minister Salman Khurshid confirming his participation at the CHOGM in Sri Lanka in November.
The activists belonging to the Dravidar Viduthalai Kazhagam damaged the gate lights also, police said.
They had set ablaze the log wrapped in a gunny bag dipped in petrol before throwing it inside the premises at 5am.
Some pamphlets were also thrown inside the premises asking the Centre to respect the feelings and sentiments of Tamilians and Prime Minister Manmohan Singh and Khurshid not to attend the Commonwealth Heads of Government Meeting.
The incident comes a day after two petrol bombs were hurled at two post offices in Chennai in the wee hours on Tuesday. Four persons belonging to the Periyar Dravidar Kazhagam were arrested in this connection.
Some political parties in Tamil Nadu have been demanding that India boycott the CHOGM to be held in Sri Lanka next month on the Sri Lankan Tamils issue.