AGARTALA, May 17 – Six Border Security Force men, including an assistant commandant, were killed in an ambush by insurgents of the outlawed National Liberation Front of Tripura on Thalcherra-Gobindabari road in Tripura’s Dhalai district today. Police said that two vehicles carrying BSF men of the 22nd battalion were returning to Chhamanu from Thalcherra area of the district when the insurgents lobbed two powerful grenades at them and then pumped bullets at the vehicles around 12.30 pm, killing six people on the spot. The ultras snatched one LMG, three SLRs and two carbines. The police said the BSF team was patrolling to provide security to medical teams which arrived here from different parts of Chhamanu for controlling gastroenteritis outbreak which has claimed at least 100 lives in last one month.