At least six underworld gangs including 'Aava' are operational in the north, intelligence officials have discovered.

These gangs are named Nimalan, Jude, Sanna, Dillu and Falil.

Meanwhile, it is believed that an individual named Vinodan, who is currently in custody over a sword attack on a person, is leading the 'Aava' gang.

These organizations have emerged sometime after the end of the war in 2009.

It is believed that the Tamil films from Tamil Nadu also had an effect on the creation of such gangs.