Anti-corruption activist and Gandhian Anna Hazare has reportedly received a threat letter warning him to dissociate himself from former aide and current Delhi chief minister Arvind Kejriwal. 

Hazare received the letter last week, in which he was warned that he will be 'bumped off' like anti-superstition activist Narendra Dabholkar, who was shot dead in Pune in 2013. 

Hazare has been critical of Kejriwal since the two parted ways after coming together for several demonstrations under the India Against Corruption umbrella. 

The latter went on to form the Aam Aadmi Party, which won the Delhi assembly elections early this year. 

The threat letter warns Anna Hazare to remain in Ralegan Siddhi, his village in Maharashtra.

"The letter is dated August 7 and is mostly written in English," a police official told the Press Trust of India.

Hazare had met Kejriwal last month as the Aam Aadmi Party was in the midst of an internal crisis over the expulsion of Yogendra Yadav and Prashant Bhushan. 

The Ahmednagar police have registered a complaint under Section 506 (criminal intimidation) of the Indian Penal Code. 

Hazare has said that he will go on a fast unto death from 2 October if the Modi government does not implement the One Rank One Pension (OROP).