The Islamic State (Isis) has threatened to kill Reserve Bank of India Governor Raghuram Rajan in an email sent to his official account purportedly from Isis gmail ID.

"I have been given money by somebody to eliminate you. If you will pay me more than I have been paid, then we can decide on it," the email, sent from isis583847@gmail.com said.

Mumbai Police Commissioner Rakesh Maria confirmed that earlier this month, Rajan received an email sent from the purported email ID. 

"We have received a complaint that a threat email was sent to the RBI governor. The email also contained the name of ISIS. We are not taking this lightly and all efforts are being made to trace the culprits," Daily News & Analysis quoted Maria as saying.

After RBI officials informed the joint commissioner of crime branch about it, the police's Cyber Crime Investigation Cell (CCIC) contacted Google for information on the gmail account of Isis.

The details they accessed from the search engine company revealed that the email account was accessed from 10 different nations. 

"We have received the login and logout details of the mail ID and the probe reveals that they were accessed from outside India," a police source said, adding that Australia, the US, Canada, Germany Ukraine, Nigeria, Itlay, Belgium, Poland and Hong Kong are the 10 countries from where the email ID was accessed.

The police however suspect that the gmail account user has used proxy Internet Protocol address.