NEW DELHI: West Bengal Police on Saturday arrested a campus security guard, marking the fourth arrest in the alleged gang-rape case of a law student at a Kolkata college.The arrest comes two days after a 24-year-old law student from South 24 Parganas accused multiple individuals of sexually assaulting her in the security guards’ room of her college on Wednesday evening. She told police she had been offered a key student union post before the alleged assault.Three individuals — Manojit Mishra, a former student and now ad-hoc staffer; and two current students, Pramit Mukherjee and Zaib Ahmed — were arrested on Thursday.The main accused Mishra, who had been expelled from the college’s Trinamool Congress student wing in 2021, completed his law degree in 2022 but later returned to the campus in a non-teaching role. Mukherjee, a first-year student, and Ahmed, in his second year, are believed to be close associates of Mishra.According to the survivor, she had stayed back at the union room on Wednesday evening after being asked by Mishra and others. She was allegedly offered biscuits and promised a position in the union. She said Mishra later proposed marriage, and after she refused, she was dragged to the guards’ room where the assault took place.In her complaint, the woman said she was threatened with video recordings of the incident and beaten with a hockey stick when she tried to resist. She was reportedly released only after pleading she was experiencing a panic attack. Her father picked her up from the college later that night.She filed a police complaint the next day. Investigating officers said medical tests were conducted at Calcutta National Medical College and Hospital, and statements from witnesses have been recorded. Senior officials, including the Joint Commissioner of Police (Crime & Traffic) and the Deputy Commissioner of the South Suburban Division, visited the college on Friday.(The victim’s identity has not been revealed to protect her privacy as per Supreme court directives on cases related to sexual assault)