District Collector K Vivekanandan issued the order today to detain G.Sankar (36), S.Sakthi (36), M.Durai (47), G.Asokan (30), S.Adhiyaman (30) and C.Santhosh (20), police said.
Investigations found that the six, who were arrested on June 28 and lodged in the Salem Central Jail, had allegedly received training from Maoists in neighbouring states, police said, adding, based on the reports Dharmapuri Superintendent of Police Asra Garg recommended to detain them under NSA.
The six persons were arrested from Natham colony near a burial ground where the body of Dalit youth E Elavarasan had been laid to rest. His body was found on a railway track on July 4 last year.
Police had also seized two country-made guns and several country-made bombs.
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Elavarasan's death had come barely hours after his wife Divya had stated she would never go back to him and would live with her mother.
Her marriage and her father's subsequent suicide had triggered violence in three villages of Natham, Kondamapatty and Annanagar on November 7 2012 when about 296 huts belonging to Dalits were torched, allegedly by caste Hindus.