The police said the motive behind the incident could be known only after a detailed investigation. They also suspect that some data might have been stolen from the website.
The hacker had also posted views on attacks on women and children, police said.
The technical experts have set right the portal and its operations have resumed, they said.
Meanwhile, the corporation officials have lodged a complaint with the cyber crime police.
The police added that the hacker claimed to be a "loan injector".
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