Ranaghat/Kolkata: An elderly nun was allegedly gang-raped by dacoits at Gangnapur in Nadia district early on Saturday triggering blockade of road and rail tracks as West Bengal Chief Minister Mamata Banerjee ordered a CID probe into the incident.

District Magistrate P B Salim, who rushed to the spot, told PTI it was a heinous act and police were already on the lookout for the gang members.