PATNA, July 22 -- Three unidentified armed assailants gunned down one Aditya Kumar Singh alias Chotu (40), a security agency owner at Sadawah village under Dulhin Bazar police station on Monday morning, police said. The incident took place when Aditya was standing near his house. The assailants on their bikes came close to Aditya, who ran a security agency in Jakkanpur area of Patna, and opened fire at him, in which he fell down, police added. Locals told police that the assailants quietly reached the spot and shot at Aditya's head and chest and sped off. No argument had taken place with the victim before the shooting, they added....