KOLKATA: Police filed the first chargesheet Saturday in the alleged gang rape of a 24-year-old law student at a Kolkata college, naming four men nearly two months after the main accused was arrested. The crime allegedly occurred June 25 between 7.30pm and 10.50pm in a security guard’s room on campus. Survivor’s complaint led to arrests of temporary staffer Manojit Mishra and students Pramit Mukhopadhyay and Zaib Ahmed. Security guard Pinaki Banerjee, 51, was also arrested after alleged inconsistencies in his statement.The 658-page chargesheet filed in Alipore chief judicial magistrate’s court contains 170 pages of main evidence, testimonies of 80 witnesses, DNA test results, medical and forensic reports. Sources said Mishra’s DNA matched collected samples. Mishra alias Mango, a 31-year-old former Trinamool students’ wing functionary, faces multiple charges under BNS, including section 70(1) (gang rape) carrying a minimum 20-year term, extendable to life. Additional charges include BNS 127(2), 77, and other sections. Public prosecutor Sourin Ghosal said: “This is a fit case of custody trial where we are confident of securing conviction.”