(KUNA) -- As many as two insurgents of the outlawed National Liberation Front of Tripura (NLFT) were killed Tuesday in an encounter with security forces in India's Northeastern state of Tripura, which borders Bangladesh. The encounter took place in Tripura's Dhalai district, news agency Press Trust of India reported, quoting a state police officer. The encounter lasted for almost 15 minutes, the officer added. A grenade and 27 cartridges were recovered from the slain insurgents. Tripura shares 856-km-long border with Bangladesh. NLFT and All Tripura Tiger Force are the two main rebel groups of Tripura. Leadership of both ATTF and NLFT are based in Bangladesh and operate from there. India has been seeking their extradition for long. Earlier this month Bangladesh had deported NLFT leader Sujit Debbarma to India, in the first such gesture. Since last month 32 NLFT rebels have surrendered to the Indian security forces in Tripura.