A BSF (Border Security Force) helicopter on anti-Naxal duty crashed on the outskirts of Ranchi today, killing two pilots and a technician on board. The Dhruv was going to Chaibasa from Ranchi when its engine caught fire and it crashed in Khunti jungle, a senior BSF official said. Aircraft completely burnt out. Pilot named as Captain K V Thomas (52), and co-pilot as S P Singh Bhandal, age 55