A case against the former IPS officer was registered at the Vastrapur police station on Aug 5 after a complaint was lodged by Mehta.
"The case has been transferred to the city crime branch," said a senior crime branch official.
In his affidavit, Bhatt stated that someone from the Special Investigation Team (SIT) was leaking out secret details related to its investigations to Tushar Mehta and claimed that he saw unusual e-mails from the SIT which is investiagting into the riots cases, in Mehta's personal mail account.
Mehta in his complaint accused Bhatt of hacking into his mail account and passing on the information to others.
"These communications contain my personal, official, and legal correspondences which were not only seen by Bhatt but also shared with others for ulterior motive, which, apart from being a criminal offence, violates my right of privacy," said Mehta's complaint.
Bhatt had alleged that Mehta recived sensitive information from the SIT appointed by the Supreme Court which was probing against Chief Minister of Gujarat, Narendra Modi and others post the Godhra riots.
The probe will be conducted by the crime branch's cyber cell, said officials.