Gautam Adani, the billionaire chair of Adani Group and one of the world's richest people, has been indicted in New York over his role in an alleged multibillion-dollar bribery and fraud scheme, according to US prosecutors.

Authorities said Adani and seven other defendants, including his nephew Sagar Adani, agreed to pay about $265 million in bribes to Indian government officials to obtain contracts expected to yield $2 billion of profit over 20 years, and develop India's largest solar power plant project.

Fallout for the Adani empire was immediate. Adani Green Energy cancelled plans on Thursday to raise $600 million in US dollar-denominated bonds, according to four sources with direct knowledge of the matter. The bond had been priced but was pulled following the news.

Adani Green Energy did not immediately respond to a request for comment on the shelved transaction.

In early Asian trading on Thursday, Adani dollar bonds slumped, with prices down between 3-5c on bonds for Adani Ports and Special Economic Zone. The falls were the largest since the Adani Group came under a short-seller attack in February 2023. The Adani Group has not responded to requests for comment on the indictment.