Swooping down on various locations, NIA with the help of Tamil Nadu and Telangana Police, apprehended four youths for their involvement in the blasts at court complexes.
"During sustained examination, three of the four confessed about their involvement in these blasts," NIA spokesman said, adding three of them have been placed under arrest while the fourth was still being questioned.
Those arrested are Abbas Ali (27), a resident of Madurai, Suleiman (23), a resident of Chennai and Samsum Karim Raja of Madurai.
Ali studied up to class VIII and worked as a painter. He also ran a library in the name 'Darul Ilm' at Madurai. Suleiman was working in a software firm and was the main leader of the terrorist gang.
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The role of the fourth one, Mohammed Ayub Ali (25) of Madurai, who works as a public liaison officer for a hearing aid company, was being examined by the NIA, the spokesman said.
The group had claimed responsibility for these blasts and circulated pamphlets, pen drives and CDs in the name of "The Base Movement", translation of the word al Qaeda.
The three arrested persons will be produced before the local courts in Chennai and Madurai for seeking transit remand for taking them to NIA special court at Bangalore, where the agency has registered a case relating to Mysuru blast case.
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