Organised by the Roman Catholic Archdiocese of Calcutta, the rally was held at the city's Allen Park to condemn the incident and express anguish of the people.
Besides members from most of the city parishes, a sizeable section of youngsters took part in the protest march.
Early Saturday. suspected robbers barged in at the missionary-run school Nadia's Ranaghat, located over 75km from Kolkata, took away Rs. 12 lakh and other valuables and gangraped the 72-year-old Mother Superior of the convent.
Superintendent of Police Arnab Ghosh said with the detention of two persons on Monday, the number of those held in connection with the incident rose to 10.
The CCTV footage at the convent had shown visuals of four persons, who were allegedly involved in the crime. The SP had announced a reward of Rs one lakh to any individual providing credible information leading to the arrest of the accused.
Ghosh said seven to eight persons were involved in the crime and it is now being ascertained whether the detained resemble the persons seen in the CCTV footage.
Director General of Police G M P Reddy visited the convent during the day.
Chief Minister Mamata Banerjee had announced CID probe into the incident. , said investigation is on into the crime that took place in the early hours of Saturday last.
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