An anonymous letter received by a sweets and savories shop in Indore city of Madhya Pradesh state warned of serial blasts, threatening to assassinate Congress Parliamentarian Rahul Gandhi.
The letter also claims that senior Congress member and Madhya Pradesh's former State Chief Kamal Nath will be attacked along with Gandhi.
A police investigation into the matter found that an unknown person left the threatening letter outside the sweet shop on Friday morning. The authorities are now searching for suspects based on CCTV footage installed nearby.
Meanwhile, Congress politician Kamal Nath told reporters that he spoke with Madhya Pradesh State Chief Shivraj Singh Chouhan who assured him that all security arrangements are in place.
Gandhi kickstarted Bharat Jodo Yatra (Unite Indian Campaign) on 7 September, and has covered approximately 1,250km.