US authorities have thwarted a plot to kill a Sikh separatist in the United States and issued a warning to India over concerns the government in New Delhi was involved, the Financial Times reported on Wednesday, citing unnamed sources.

There were no immediate responses from India’s foreign ministry or the US embassy in New Delhi to requests for comment on the report.

The Financial Times said its sources did not say if the protest to India resulted in the plot being abandoned or if it was foiled by the FBI.

The protest to New Delhi was registered after the Indian prime minister, Narendra Modi, was welcomed on a state visit by the US 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.