PRAYAGRAJ, April 17 -- The driver of a school bus and his aide were killed after the bus collided with a trailer-truck head-on in the Kohraur area of Pratapgarh on Wednesday morning, police said. The bus, which belonged to a private school, was on its way to pick students when the accident took place around 8 am on the Ayodhya-Prayagraj highway. No child was present in the bus at the time....