Hazare and his supporters want parliament to strengthen a pending anti-corruption bill and the creation of a special team to probe possible graft allegations against 15 ministers, including Prime Minister Manmohan Singh.

The 75-year-old former army truck driver threatened to fast until death if the demands are not met.

“I am confident that... the people of my country will not let me die. I draw my strength and confidence from you,” Hazare told several thousand supporters gathered at a popular protest site in central New Delhi.

Some senior members of the Hazare campaign had already started hunger strikes at the same venue four days before.

Hazare became an unlikely national hero last August when he led countrywide protests that tapped into a rich seam of public anger at India’s endemic corruption.

During a 12-day hunger strike, he was feted as a latter-day Mahatma Gandhi and mobbed at a triumphal procession through the capital New Delhi.

Singh’s government, tainted by a series of graft scandals, was caught out by the outpouring of public emotion and forced to negotiate with the Hazare campaign, which it previously condemned as manipulative and undemocratic.

Although around 4,000 supporters turned out Sunday as Hazare began his latest fast, observers say the campaign has lost much of its momentum since the heady days of last summer.

The media has also been less supportive, suggesting that Hazare risks overstepping in insisting that parliament adopts his campaign’s input for the new anti-corruption bill.

“Anna and his cohorts must realise that they are only a pressure group. They cannot hold parliament to ransom. Their primary job is to keep the issue of corruption in play,” the Times of India said in a recent editorial.

“Using fasts to arm-twist the government is against the very spirit of democracy and amounts to political blackmail,” it said.

Hazare’s direct attacks on Prime Minister Singh and the ruling Congress party have also led to accusations that he and his campaign organisers were pursuing a political agenda.