The rape of the 72-year-old nun had sparked demonstrations at a number of places, such as this peace march in Allahabad.
Four people were today detained here in connection with the gang rape of a 72-year-old nun in Ranaghat in West Bengal's Nadia district, police said.
The four people, all Bangladeshi nationals according to the police, were detained from Motinagar locality, DCP Naveen Singla said.
Kolkata Police has been informed about their detention, he said, adding police was working on further leads.
Earlier, two people were arrested from Mumbai and Habra (North 24 Paraganas) in this connection.
The nun was gang raped at a convent by unknown people at Ranaghat in West Bengal on March 14.