Three Tamil youths were arrested by police in Thunnalai on Monday.
The arrests came just days after three were arrested in a sudden early-morning round up in Thunnalai last week.
Around 45 are now estimated to have been arrested from Thunnalai and surrounding villages as a result of several police operations and deployment of Special Task Force troops.
Relations between locals and security forces remain tense since police shot and killed a Thunnalai man in July, with some anti-police protests in the Vadamaradchi region having turned violent.