Suspected Sangh Parivar activists on Tuesday night attacked the house of Selvi, the daughter of Tamil Nadu Chief Minister M Karunanidhi, in Bangalore.
The unidentified assailants hurled a petrol bomb and stones protesting her father's remarks against Lord Ram.
A Tamil Nadu government bus bound for Bangalore was set on fire at Bommanahalli, about 35km from Bangalore, police said.
A 50-member strong group, shouting slogans against Karunanidhi for his remarks on Lord Ram and Ram Sethu, hurled the bomb and stones and damaged window panes of the house, the police said.
Selvi and her husband Selvam, who is heading the Sun TV group's Kannada channel Udaya TV, were in Chennai when the incident took place, they said.
Two security personnel guarding the house were injured in the attack, they said adding the protestors pasted a sticker on the house condemning the chief minister's remarks.
The attackers dispersed on seeing the police. The police have provided security to the house.
On Saturday, addressing a public meeting at Erode in Tamil Nadu, Karunanidhi, while opposing the stalling of Ram Sethu project, had asked, "Who is this Ram? From which engineering college did he graduate?"