Archived link to the WaPo article mentioned.

The evidence isn’t public yet. But the actions Canada are taking are very serious. They’ve expelled Indian diplomats and are now accusing India’s Home Minister, the second-most powerful person in the country, to be behind the killings.

The WaPo article claims the Indian government used its diplomats to find information on people - who used Indians in Canada for this purpose, often by threatening to deny them needed immigration papers. Then, the diplomats would send this information back home.

There, the government worked with a criminal enterprise to organize killings on Canadian soil. This was all facilitated by India’s intelligence agency.

All of this information was apparently conveyed to India earlier this year, where a senior Indian official initially denied any knowledge and later admitted some information but denied others.

And apparently more will become public as the trial for the Nijjar killing begins soon.