Bouyed by the supreme court verdict in Gulbarga Society riot case, Gujarat chief minister Narendra Modi on Tuesday hit out at his detractors for "defaming" him for the 2002 riots and announced he would undertake a three-day fast for peace, harmony and unity in his state.

"One thing is apparent from the supreme court's judgment.

The unhealthy environment created by the unfounded and false allegations made against me and government of Gujarat, after 2002 riots, has come to an end. For the past ten years, it has become fashionable to defame me and the state of Gujarat," Modi said in a letter to citizens.

The controversial chief minister, who is increasingly being seen as BJP's poster boy who could play a larger role in national politics in the run up to 2014 Lok Sabha polls, insisted those defaming him could not tolerate any positive development of Gujarat.

He charged these people have not left any stone unturned to defame his state.

"It is difficult to say whether this campaign of defamation will stop even after the judgment of the supreme court. But one thing is certain that the credibility of those who have been spreading lies and defaming Gujarat has come to its lowest ebb. The people of this country will not trust such elements anymore," he said.

Modi said that as part of his responsibility to strengthen social harmony and brotherhood, he is planning to start a movement called "Sadbhavana Mission".

"As part of this Sadbhavana Mission, I have resolved to fast for three days from Saturday, 17th September 2011. My fast will conclude on 19th September. I deeply believe that this fast will further strengthen Gujarat's environment of peace, unity and harmony," Modi said.

The supreme court verdict yesterday directing SIT (special investigation team) to either file a final report or a chargesheet in the Gulbarga case to be tried in a lower court has come as a shot in the arm for Modi.