Kolkata, June 29 -- The Kolkata Police on Saturday arrested a security guard of the government-run law college where a first-year student was allegedly gang-raped by three men and also formed a five-member SIT to probe the crime, officials aware of the matter said. "The security guard was arrested this morning after we found that his replies were incoherent. His presence at the college has been captured in the CCTV installed in the college," a senior officer said. P6...