PRAYAGRAJ, June 21 -- A four-year-old boy and a 28-year-old man were killed, while another person was injured after two motorcycles collided head-on on the Prayagraj-Chitrakoot Highway in the trans-Yamuna region of Prayagraj district late on Friday night, police said. According to police, Arvind Adivasi, a resident of Mohali Garhi village in Madhya Pradesh's Rewa district, was travelling to his in-laws' house in Chitrakoot with his wife and four-year-old son, Kritim, when their motorcycle collided with another bike coming from the opposite direction. Kritim and the other rider, identified as Arif Khan, 28, a resident of Chhipiya village in Chitrakoot district, suffered critical injuries and later succumbed to injuries. htc...