In his complaint to the Umara police station in Surat yesterday, Income Tax Inspector Prem Pulninath, a resident of the Income Tax Colony in Majura Gate area alleged that a person called Bavaji had called him up on the land line number of his mother's residence in Ahmedabad on Friday, Umara police sources said.
After his mother picked up the phone, the caller allegedly threatened her that he would kill her son if he comes in their way, Umara police sub-inspector S M Soni said.
After learning about the threat call to him and his mother, Nath lodged an FIR yesterday, Soni said, adding that Nath is among Income Tax officers who are probing illegal investments made by Asaram Bapu and his son Narayan Sai.
"Nath is one of those Income Tax officers who is probing a disproportionate wealth case against Sai and Asaram. The caller was angry at the officer for the probe and threatened him of dire consequences if he went ahead with the case against Sai," Surat City Commissioner of Police Rakesh Asthana said.