The raids, as per official sources, began at 3:30 am and involved as many as 300 NIA officials from across its various offices.
In another major crackdown on the Popular Front of India, police along with other investigative agencies conducted raids across several states on Tuesday.
The raids, taking place mainly in South India, was termed by the NIA as the 'largest ever' investigation process 'till date'.
Tripura's outgoing chief minister Manik Sarkar will be shifting to his new residence - the Communist Party of India-Marxist's state committee office.
Police raids on several Popular Front offices across Kerala have unearthed a massive catch of arms and explosives.