In a bus- autorickshaw collision in Bihars Purnia has killed at least four people, out of which three died on the spot and fourth scumbled to injuries died on his way to hospital.According to the sources, all the four died in the accident were residents of Bishanpur village of Purnia and were on their way to Purnia Court in connection with a land dispute case.The Superintendent of Medical College Purnia, Varun Thakur informed that the incident took place near the ethanol factory near Krityanand Nagar Police station area. The injured are being treated in the Purnia Medical College.Further details in the case are awaited.