The Speedy Trial Tribunal of Sylhet Division yesterday sentenced two people to 31 and 17 years' rigorous imprisonment in two sensational arms and explosives cases. The convicts are Rajkanta Dev Barma alias Sunil Chowdhury of Srimangal and Hamir Dev Barma of Komolganj upazila of Moulvibazar district.The cases were filed following a gunfight between criminals and a joint team of Rapid Action Battalion (Rab) and Bangladesh Rifles (BDR) at a bordering village in Komolganj that left six people killed on May 27 last year. Rajkanta and Hamir Dev were arrested from the spot. The BDR and Rab raided the area suspecting that a group of Indian criminals gathered there. They seized one sub-machine gun, six grenades, four wireless sets, 134 bullets, three mobile phones and some Bangladeshi and Indian currencies from the spot. Judge Biplob Goswami sentenced Rajkanta to 31 years and Hamir Dev to 17 years in jail.