RANCHI, April 11 -- Police arrested the principal of a government-run residential school under Hunterganj police station limits in Chatra district of Jharkhand following allegations that he raped a 13-year-old student, who was subsequently found to be pregnant, officials said on Friday. "The accused, identified as Shankar Prasad, was taken into custody on Thursday night after a medical examination confirmed the minor's pregnancy," a police officer said....