A plot to kill a Sikh separatist in the US was foiled by US officials, and India was warned because of worries that the New Delhi government may have been involved, the Financial Times said on Wednesday, citing unidentified sources.

Requests for comment on the report were not immediately answered by the U.S. embassy in New Delhi or the foreign ministry of India.

According to The Financial Times, the sources did not specify if the plot was thwarted by the Federal Bureau of Investigation (FBI) or whether the plotters abandoned it as a result of the protest to India.

The protest to New Delhi was registered after Indian Prime Minister Narendra Modi was welcomed on a state visit by President Joe Biden in June, the report said.

The report comes two months after Canada said there were “credible” allegations linking Indian agents to the June murder of a Sikh separatist leader, Hardeep Singh Nijjar, in a Vancouver suburb.

India has rejected Canada’s accusations.

Apart from the diplomatic warning to India, U.S. federal prosecutors have also filed a sealed indictment against at least one suspect in a New York district court, the FT report said.

The paper identified Gurpatwant Singh Pannun as the target of the foiled plot.

The FT report said Pannun had declined to say whether U.S. authorities had warned him about the plot, but quoted him as saying he would “let the U.S. government respond to the issue of threats to my life on American soil from the Indian operatives”.