The charge sheet was filed in the special NIA court in Puducherry against Thiruselvam, Thangaraj, Kaviyarasan, Kalailingam, Karthik and John Martin, an official statement of the probe agency said here.
The case pertains to the planting of the bomb beneath the car parked in front of the residence of Narayanasamy, the then Minister of State in PMO, at Ellai Amman Koil Street in the union territory.
The NIA claimed in the statement that the investigation undertaken by it had "conclusively established" that the accused were involved in a criminal conspiracy and committed a terrorist act.
The incident took place on January 29 when the security personnel on duty at the residence of the former minister found a suspicious object suspected to be an explosive material below the car.
TNLA is a small group which came into existence after India had sent its forces to Sri Lanka.