Mumbai Police registered a non-cognisable offence over threat emails naming Mayor Ritu Tawde's office, Amitabh Bachchan's Juhu residence 'Jalsa', and Diljit Dosanjh's November 27 concert venue. Preliminary investigations suggested the emails might have originated from Norway using a VPN, news agency IANS reported. The email claimed that it was sent by an outfit called Khalistan National Army.