Four persons, all Bangladeshi nationals, were detained from Motinagar locality by Punjab Police, DCP Naveen Singla said.

Kolkata Police has been informed about their detention, he said, adding police was working on further leads.

Also Read: Caretaker of Ranaghat missionary school interrogated by CID

Earlier, two people were arrested from Mumbai and Habra (North 24 Paraganas) in this connection. Both were identified as Bangladeshi nationals.

The septuagenarian nun was gang raped at a convent by unknown people at Ranaghat in West Bengal on March 14.

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