Police nabbed four alleged radical ultras in Kanker district of Chhattisgarh on Tuesday. The apprehended youth are suspected to be involved in several cases of murder and instigating violence in the area, police said. Acting on a tip-off, the police nabbed them from a dense forest near Kanker and recovered two guns and Maoist literature. The arrested individuals are suspected to be Maoist sympathisers, who were being indoctrinated and lured to join the rebels.