Unidentified persons on Thursday hurled crude bombs at the office of a popular Tamil television channel in Chennai, police said.
The incident occurred at a time when the news channel Puthiya Thalamaurai was under attack by a right-wing fringe outfit, Hindu Munnani, for recording a controversial current affairs programme.
No one was injured in the attack and there was not much damage to property of the TV channel.
The bombs were of low-intensity, police said.
The incident happened in the early hours on Thursday when four motorcycle-borne youths hurled two crude bombs packed in tiffin boxes.
No one has been detained in this connection and police have formed seven teams which are investigating leads that allegedly point towards involvement of rightwing groups.
Journalists at the Puthiya Thalaimurai said the whole incident had been caught on a CCTV camera.
The incident comes close on the heels of the channel removing a controversial show about 'Thaali' (Mangalsutra) on Sunday when Hindu Munnani activists opposed it and staged a protest.
Unidentified persons had also attacked a videojournalist and damaged his camera in an attempt to intimidate the channel.
Video: Tamil news channel attacked