Amaravati: Union surface transport minister Nitin Gadkari has issued a warning of death by unknown persons who called the land line of the camp office. The staff of Nitin Gadkari’s office received the phone calls and lodged a complaint with the Nagpur police. The office staff revealed that they received three threatening phone calls. The complaint stated that these threatening phone calls were received at 11.29 am, 11:35 am and 12.32 pm. It is said that the unknown persons mentioned the name of Dawood Ibrahim during the threatening call. As soon as the complaint was received, the police and senior officials reached Gadkari’s office and started an investigation. Gadkari is currently in Nagpur and is safe, police said. The Gadkari camp office is at Khamlachowk, Nagpur.