PRAYAGRAJ, June 27 -- A primary school teacher and his mother died in a road accident at Leprosy Mission Crossing in the Naini police station area on Thursday after being hit by a cement tanker. The teacher was taking his mother to Lucknow for her treatment. They were headed to the railway station to board Sangam Express when the accident occurred . On receiving information, Naini police reached the spot and seized the cement tanker and sent the bodies for a post-mortem examination. Shankargarh resident, Krishna Bihari Mishra, 50, had come to Naini on Tuesday to get his mother Usha Devi, 75, treated at SGPGI, Lucknow. On Thursday morning, he and his mother left on a bike for the railway station, from where he had to go to Lucknow. But while crossing the road at Leprosy Crossing, they were hit by a cement tanker, due to which the mother and son died on the spot. Krishna Bihari was a teacher in a primary school in Karbi, Chitrakoot. A case has been lodged against the owners of the tanker as well as the driver....