Mumbai. The series of threatening calls and emails in the country is not stopping. Now the Reserve Bank of India (RBI) has received a bomb threat. A threatening email in Russian language appeared on the Reserve Bank’s website on Thursday afternoon. In this mail, there is a threat to blow up the Reserve Bank of India with explosives. A case has been registered against the unknown accused at Mata Ramabai Marg (MRA Marg) Police Station. Mumbai Police is investigating the matter.