"Gilani left the jail premises around 8.40 PM. His relatives and lawyer had come to receive him," a senior official said.
Gilani was lodged in jail number 1 in Tihar, the official said.
A Delhi court today issued the warrant for the release of Gilani. He had been granted bail last week in a sedition case.
However, his release from Tihar Central jail was delayed as his permanent address in Jammu and Kashmir, mentioned in his bail bond, could not be verified.
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Gilani was arrested on February 16 in connection with an event at Press Club of India here during which anti-national slogans were allegedly raised by a group.
A case under charges of sedition, criminal conspiracy and unlawful assembly was registered in connection with the Febraury 10 event.
The police had said the hall in the Press Club was booked by Gilani, through his associate Ali Javed by using his (Gilani's) credit card and another man Mudassar was also involved.