The man who allegedly sent an anonymous letter last week threatening blasts during the Congress' Bharat Jodo Yatra in Indore in Madhya Pradesh and assassinations of party leaders Rahul Gandhi and Kamal Nath has been identified and efforts were on to nab him, police said on Monday.

The letter, which referred to the anti-Sikh riots of 1984, was received at a sweet and snacks store in the Juhi area of Indore on November 17.