In a shocking incident that unfolded on Diwali night in the national capital, a 40-year-old man and his teenaged nephew were shot dead by armed assailants outside their house in Shahdara on Thursday, police said. The Delhi Police have formed three teams to crack the case. The man riding the two-wheeler has been detained while the shooter is still at large. The deceased have been identified as Akash Sharma alias Chottu and his nephew, Rishabh Sharma (16). In the firing, Akash's 10-year-old son Krish Sharma also sustained bullet injuries. The incident occurred when the victims were celebrating Diwali outside their house in Shahdara's Farsh Bazar area at around 8 pm.