What US agents knew before a Sikh separatist was killed in Canada

US prosecutors have charged an Indian man with a plot to kill at least four Sikh separatists in North America. The indictment links the case to the murder of a Canadian citizen earlier this year, and has prompted questions about what US agents knew in the days before his death.

On 18 June, Nikhil Gupta watched a video of a Sikh separatist leader who had been shot dead in Canada in his car, his bloody body slumped over the steering wheel.

Mr Gupta then forwarded the video to a man he is accused of hiring as a hitman for another murder, in a different country. On the phone the next day, Mr Gupta told the man that the Canadian activist had been a "target", "#4, #3" on a list.

"We have so many targets," Mr Gupta said. "The good news is this: now no need to wait."