India anti-graft activist spends night in jail
An aide said he would leave the prison only after he was given permission to continue his fast at a city park.
Mr Hazare was arrested on Tuesday morning, hours before his fast against a proposed new anti-corruption law.
He is continuing with his hunger strike in jail. Hundreds of supporters have kept an overnight vigil outside.
On Wednesday morning, groups of people have started joining the protest outside the jail.
Many of them are carrying the Indian flag and shouting anti-corruption slogans.
Supreme Court lawyers have announced they will march to show their support for Mr Hazare. Autorickshaw drivers have gone on strike to protest against corruption.
The government has denied it is stifling democratic protest after police arrested 1,300 people to halt Mr Hazare's hunger strike on Tuesday.
India's Home Minister P Chidambaram said the detentions were because protesters had not obeyed police conditions for the demonstration.
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