Self-styled general secretary of United Tribal Liberation Army (UTLA) Seinio Guite alias James Kuki (29), who had on July 13 last hurled a grenade at the petrol pump demanding payment of Rs 10 lakh, was arrested when he came to collect the money from pump personnel, they said.
Police arrested him along with a small arm, sources said adding that another UTLA man escaped.
Meanwhile, an army major (name withheld) of 22nd Assam Rifles battalion came to the police station along with some para military forces, reports from the border town said adding that the para military forces demanded immediate release of Guite on the ground that they were to surrender to Assam Rifles soon.
There was some argument between the two forces, reports said adding an FIR has been lodged with the police station against the particular army officer.