Following arrest of two top insurgents of United Liberation Front of Assam (Ulfa), Border Security Force (BSF) has  intensified it's vigil and stepped up patrolling along the 856km long porous border with Bangladesh, official sources said today.

Vigil along the border has been intensified following arrest of Shashadhar Chowdhury and Chitraban Hazarika, two top insurgent leaders of Ulfa in border areas of West Tripura district and all the border outposts were alerted so that no one could sneak into Indian territory, sources said.

BSF earlier, in a statement said that the religious fundamentalists were using the Tripura border as corridor to enter Indian territory.

DIG, police control, Nepal Das said, "mobile forces of the state police in bordering areas, including markets, have been intensified and the police stations near the Indo-Bangla border have been alerted because of the possibility of more insurgents sneaking into our territory can not be ruled out."

He said, after the present Awami League dispensation under Sheikh Hasina came to power in Bangladesh, many insurgents of the two banned outfits โ€” All Tripura Tiger Force (ATTF) and National Liberation Front of Tripura โ€” had surrendered to different security forces.