A blast took place in a hospital owned by an environmental activist at Sompeta in Andhra Pradesh's Srikakulam district. No one was injured but a portion of the hospital was damaged, police said.
The blast occurred on the third floor of Mahalakshmi Nursing Home. There was still no word from the police about the nature of explosives used and who could be behind the attack.
Y. Krishna Murthy is the convenor of environment protection committee, which is fighting against the proposal to set up a thermal power plant at Sompeta, 600 km from here. His supporters allege that the blast was to threaten him to silence.
The committee took out a peace rally after the blast, demanding action against the guilty.
The environment protection committee along with other NGOs have been opposing the proposed thermal power project by Nagarjuna Construction Company (NCC).
It was on their petition that National Environmental Appellate Authority (NEAA) in July overruled the environmental clearance given for the 2,640 MW project coming up at a cost of Rs.12,000 crore.
Earlier on July 14, two people were killed and over 100 injured in police firing on protesters.
The groups had been protesting against the project on the ground that it would destroy the ecology and endanger their livelihood.