At least seven country-made bombs went off at a village adjoining the Kudankulam nuclear plant in Tamil Nadu around 10.15pm on Wednesday, according to TV reports.
Nobody was injured in the explosion, a local source and a report in Sun TV said.
The crude bombs were reportedly hurled at a cluster of houses in Indinthakarai village owned by fishermen supporting the nuclear project. The attackers allegedly belonged to a group opposed to the project.
Indinthakarai village has been the hub of the anti-nuclear plant agitation and a majority of the fishing population here is said to be opposed to the project.
The village has been on the boil for the last few days after a small group of residents expressed their support for the project, Sun TV reported.
This is not the first time country-made bombs have gone off in Indinthakarai. In November last year, six persons were killed after bombs that they were surreptitiously manufacturing exploded accidentally.
In the last year, there have been at least four bomb attacks in the region where groups for and against the project are at odds.