In another twist to the feud between the Ambani brothers, the younger sibling Anil's Group is understood to have filed a defamation suit for a whopping Rs 10,000 crore (Rs 100 billion) against elder Mukesh Ambani for remarks purported to have been made by him in an interview with the New York Times several weeks ago.

Mukesh Ambani-led RIL [Get Quote] spokesperson declined to comment on any query related to this development, while the spokesperson for Anil Ambani's Group was inaccessible despite several attempts.

The defamation suit is believed to have been filed in the Bombay high court about a month ago, but no details of the 200-page petition were available immediately.

New York Times quoted him saying that a network of lobbyists and spies were overseen by his brother before they split.

"What most distinguishes Reliance from its rivals is what Ambanis friends and associates describe as his 'intelligence agency' a network of lobbyists and spies in New Delhi who they say collect data about the vulnerabilities of the powerful, about the minutiae of bureaucrats' schedules, about the activities of their competitors," the New York Times had said.

Mukesh is purported to have said in the interview that all such activities were overseen by his brother before they split, and had since been expunged from his tranche of the company. "We de-mergered all of that," Mukesh was quoted as saying.