Agartala, Dec 23 (IANS): Tripura State Rifles (TSR) troopers have arrested a Bangladesh national with three lakh taka (Bangladesh currency) and two mobile phones, police said here Monday.

Police are yet to ascertain the motive of Nunakashi Chakma, 28, for entering Indian territory with the large sum of cash.

"During a routine operation by the TSR jawans, Chakma was arrested from bordering Raishyabari village (195 km from here in northern Tripura) Sunday night," a police spokesman said.

The illegal entrant is a resident of Ghagracherri village in the mountainous Chittagong Hill Tracts in southeast Bangladesh.

Senior police and intelligence officials were interrogating the tribal youth.

India has stepped up security along the border with Bangladesh in view of the political turmoil in that country.

"We have asked our jawans to keep a close watch on the border. Our men remain vigilant round-the-clock, especially where a substantial number of people reside across the border," BSF Public Relations Officer Bhaskar Rawat said.

Another BSF official said: "We were apprehensive that when Bangladesh deploys its army before their general elections (due Jan 5) and starts taking action against miscreants and wrongdoers, there might be some influx of people from across the border into India."

India shares a 4,096-km border with Bangladesh, including 856 km in Tripura. A large portion of the international border remains unfenced and porous.