FT: US authorities thwarted a conspiracy to assassinate a Sikh separatist on American soil and issued a warning to India’s government over concerns it was involved in the plot. https://www.ft.com/content/56f7d6d6-6a93-4172-a49e-d8a91991e29d
US thwarted plot to kill Sikh separatist on American soil

Joe Biden raised concerns of New Delhi involvement with India’s Narendra Modi in September

Financial Times
“We are treating this issue with utmost seriousness, and the U.S. Government has raised it with the Indian Government, including at the senior-most levels. Indian counterparts expressed surprise and concern. They stated that activity of this nature was not their policy," says NSC spokesperson Adrienne Watson.
"Based on discussion with senior U.S. Government officials, we understand the Indian government is further investigating this issue and will have more to say about it in the coming days. We have conveyed our expectation that anyone deemed responsible should be held accountable," adds Watson in a statement.
My VOA News report: India alleged to have plotted an assassination on US soil. https://www.voanews.com/a/india-alleged-to-have-plotted-assassination-on-us-soil/7365996.html
India Alleged to Have Plotted Assassination on US Soil

The case has similarities to a killing in June of a Sikh separatist in Canada

Voice of America (VOA News)