Raipur, June 18 -- Three people, including a 60-year-old man, were burnt alive and two others sustained serious injuries after a violent clash allegedly linked to a long-running dispute over sand mining operations in Chhattisgarh's Korea district, police said on Wednesday, adding that four people were arrested in relation with the incident, while efforts were on to nab the others. Additional superintendent of police Suresha Chaubey said the incident took place on Tuesday night in Sonhat tehsil. The victims were travelling in two vehicles, including an SUV, when they were attacked by the rival group. "The attackers repeatedly rammed the SUV with a light tipper truck, damaging it and jamming its doors, preventing those inside from escaping. The SUV, subsequently, caught fire. Witnesses claimed that some occupants who tried to break the vehicle's windows and come out were assaulted by the attackers," Chaubey said. Three of the occupants were charred to death in the incident, while two others travelling in the SUV suffered severe burn injuries. Two occupants of the second vehicle were seriously injured. "We have arrested four accused and efforts are underway to trace the other suspects," said Chaubey....